|  | 
                Christopher Posner
                 President and Chief Executive Officer Cara Therapeutics, Inc. |  | 
![[MISSING IMAGE: lg_caratmtherap-4c.jpg]](lg_caratmtherap-4c.jpg) 
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|  |  |  |  | F-1 |  |  | |
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                OF INCORPORATION OF CARA THERAPEUTICS, INC. TO PROVIDE FOR REVERSE STOCK SPLIT
               |  | 
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                Name 
               |  |  | 
                Position with the 
                 Combined Company |  |  | 
                Current Position at Tvardi 
               |  | 
| 
                Imran Alibhai, Ph.D. 
               |  |  | Chief Executive Officer and Director |  |  | 
                Chief Executive Officer and Director 
               |  | 
| 
                Dan Conn, J.D., M.B.A. 
               |  |  | Chief Financial Officer |  |  | Chief Financial Officer |  | 
| 
                John Kauh, M.D. 
               |  |  | Chief Medical Officer |  |  | Chief Medical Officer |  | 
| 
                Jeffrey Larson, Ph.D., DABT 
               |  |  | 
                Senior Vice President, Research & 
                 Development |  |  | 
                Senior Vice President, Research & 
                 Development |  | 
| 
                Yixin “Joseph” Chen, Ph.D. 
               |  |  | Vice President, Chemistry, Manufacturing and Controls |  |  | Vice President, Chemistry, Manufacturing and Controls |  | 
![[MISSING IMAGE: fc_pipeline-4clr.jpg]](fc_pipeline-4clr.jpg) 
          | 
                  Name 
                 |  |  | 
                  Position with the Combined
                   Company |  |  | 
                  Current Position at Tvardi 
                 |  | 
| Imran Alibhai, Ph.D. |  |  | 
                  Chief Executive Officer and Director 
                 |  |  | 
                  Chief Executive Officer and Director 
                 |  | 
| Dan Conn, J.D., M.B.A. |  |  | Chief Financial Officer |  |  | Chief Financial Officer |  | 
| John Kauh, M.D. |  |  | Chief Medical Officer |  |  | Chief Medical Officer |  | 
| Jeffrey Larson, Ph.D., DABT |  |  | Senior Vice President, Research & Development |  |  | Senior Vice President, Research & Development |  | 
| Yixin “Joseph” Chen, Ph.D. |  |  | Vice President, Chemistry, Manufacturing and Controls |  |  | Vice President, Chemistry, Manufacturing and Controls |  | 
| 
                Proposal  Number |  |  | 
                Proposal 
                 Description |  |  | 
                Vote Required for Approval 
               |  |  | 
                Effect of
                 Abstentions |  |  | 
                Effect of 
                 Broker Non-Votes |  | 
| 1 |  |  | Stock Issuance Proposal |  |  | FOR votes from a majority of the votes cast by the holders of shares present at the meeting (by virtual attendance) or represented by proxy and voting on the matter |  |  | 
                None 
               |  |  | 
                None 
               |  | 
| 2 |  |  | Equity Plan Proposal |  |  | FOR votes from a majority of the votes cast by the holders of shares present at the meeting (by virtual attendance) or represented by proxy and voting on the matter |  |  | 
                None 
               |  |  | 
                None 
               |  | 
| 
                Proposal  Number |  |  | 
                Proposal 
                 Description |  |  | 
                Vote Required for Approval 
               |  |  | 
                Effect of
                 Abstentions |  |  | 
                Effect of 
                 Broker Non-Votes |  | 
| 3 |  |  | ESPP Proposal |  |  | FOR votes from a majority of the votes cast by the holders of shares present at the meeting (by virtual attendance) or represented by proxy and voting on the matter |  |  | 
                None 
               |  |  | 
                None 
               |  | 
| 4 |  |  | Reverse Stock Split Proposal |  |  | FOR votes from a majority of the votes cast by the holders of shares present at the meeting (by virtual attendance) or represented by proxy and voting on the matter |  |  | 
                None 
               |  |  | 
                None 
               |  | 
| 5 |  |  | Authorized Share Proposal |  |  | FOR votes from a majority of the votes cast by the holders of shares present at the meeting (by virtual attendance) or represented by proxy and voting on the matter |  |  | 
                None 
               |  |  | 
                None 
               |  | 
| 6 |  |  | Compensation Proposal |  |  | FOR votes from a majority of shares present in person (by virtual attendance) or represented by proxy at the meeting and entitled to vote on the matter |  |  | 
                Against
               |  |  | 
                None 
               |  | 
| 7 |  |  | Adjournment Proposal |  |  | FOR votes from a majority of shares present in person (by virtual attendance) or represented by proxy at the meeting and entitled to vote on the matter |  |  | 
                Against 
               |  |  | 
                None
               |  | 
|  | 
                Tvardi Public Company Comparable 
               |  |  | 
                Lead Treatment Indication 
               |  |  | 
                Stage of 
                 Development |  | 
|  | Selected Idiopathic Pulmonary Fibrosis (IPF) Companies |  | ||||||
|  | Pliant Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 2b 
               |  | 
|  | Contineum Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 1b 
               |  | 
|  | Trevi Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 2b 
               |  | 
|  | Aileron Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 1b 
               |  | 
|  | Vicore Pharma Holding(1) |  |  | 
                IPF 
               |  |  | 
                Phase 2b 
               |  | 
|  | Selected Inflammation and Immunology (I&I) Companies |  | ||||||
|  | Upstream Bio, Inc. |  |  | 
                Severe Asthma 
               |  |  | 
                Phase 2 
               |  | 
|  | Dianthus Therapeutics, Inc.(2) |  |  | 
                Generalized Myasthenia Gravis 
               |  |  | 
                Phase 2 
               |  | 
|  | Tourmaline Bio, Inc. |  |  | 
                Thyroid Eye Disease 
               |  |  | 
                Phase 2b 
               |  | 
|  | Selected Oncology (Solid Tumors) Companies |  | ||||||
|  | Black Diamond Therapeutics, Inc. |  |  | 
                2L/3L Non-Small Cell Lung Cancer 
               |  |  | 
                Phase 2 
               |  | 
|  | Leap Therapeutics, Inc.(3) |  |  | 
                Gastric Cancer 
               |  |  | 
                Phase 2 
               |  | 
|  | Protara Therapeutics, Inc.(4) |  |  | 
                Non-Muscle Invasive Bladder Cancer 
               |  |  | 
                Phase 2 
               |  | 
|  | PMV Pharmaceuticals, Inc |  |  | 
                Advanced Solid Tumors 
               |  |  | 
                Phase 2
               |  | 
| 
                ($ in millions) 
               |  |  | 
                Diluted Market 
                 Capitalization of the Tvardi Public Company Comparables |  |  | 
                Implied Enterprise 
                 Value of the Tvardi Public Company Comparables |  | ||||||
| 
                Maximum
               |  |  |  | $ | 1,106.3 |  |  |  |  | $ | 616.9 |  |  | 
| 
                75th Percentile
               |  |  |  | $ | 661.6 |  |  |  |  | $ | 437.2 |  |  | 
| 
                Mean
               |  |  |  | $ | 428.2 |  |  |  |  | $ | 217.0 |  |  | 
| 
                Median
               |  |  |  | $ | 292.6 |  |  |  |  | $ | 108.4 |  |  | 
| 
                25th Percentile
               |  |  |  | $ | 143.3 |  |  |  |  | $ | 49.6 |  |  | 
| 
                Minimum
               |  |  |  | $ | 71.9 |  |  |  |  | ($ | 115.8) |  |  | 
| 
                ($ in millions) 
               |  |  | 
                Implied Equity 
                 Value of Tvardi |  | |||
| 
                Maximum
               |  |  |  | $ | 622.9 |  |  | 
| 
                75th Percentile
               |  |  |  | $ | 443.2 |  |  | 
| 
                Mean
               |  |  |  | $ | 223.0 |  |  | 
| 
                Median
               |  |  |  | $ | 114.4 |  |  | 
| 
                25th Percentile
               |  |  |  | $ | 55.6 |  |  | 
| 
                Minimum
               |  |  |  | ($ | 109.8) |  |  | 
|  |  |  | 
                Minimum 
               |  |  | 
                25th
                 Percentile |  |  | 
                Median 
               |  |  | 
                Mean 
               |  |  | 
                75th
                 Percentile |  |  | 
                Maximum 
               |  | ||||||||||||||||||
| 
                Implied Exchange Ratio
               |  |  |  |  | NM |  |  |  |  |  | 2.2486x |  |  |  |  |  | 4.8245x |  |  |  |  |  | 9.6242x |  |  |  |  |  | 19.3855x |  |  |  |  |  | 27.3633x |  |  | 
| 
                Implied Ownership Percentage of Cara stockholders in the Post-Merger Company
               |  |  |  |  | NM |  |  |  |  |  | 21.5% |  |  |  |  |  | 13.9% |  |  |  |  |  | 8.4% |  |  |  |  |  | 4.7% |  |  |  |  |  | 3.4% |  |  | 
|  |  |  | 
                Minimum 
               |  |  | 
                25th 
                 Percentile |  |  | 
                Median 
               |  |  | 
                Mean 
               |  |  | 
                75th 
                 Percentile |  |  | 
                Maximum 
               |  | ||||||||||||||||||
| 
                Implied Values Per Share of Tvardi Common Stock
               |  |  |  |  | NM |  |  |  |  | $ | 0.93 |  |  |  |  | $ | 2.00 |  |  |  |  | $ | 4.00 |  |  |  |  | $ | 8.05 |  |  |  |  | $ | 11.37 |  |  | 
| 
                Implied Values Per Share of Cara Common Stock
               |  |  |  |  | NM |  |  |  |  | $ | 0.19 |  |  |  |  | $ | 0.41 |  |  |  |  | $ | 0.82 |  |  |  |  | $ | 1.64 |  |  |  |  | $ | 2.32 |  |  | 
|  | 
                Tvardi IPO Comparable Company 
               |  |  | 
                Lead Treatment Indication 
               |  |  | 
                Stage of 
                 Development |  |  | 
                IPO Pricing 
                 Date |  | 
|  | Single Clinical-Stage (Non-Oncology) Asset in Phase 2 |  | |||||||||
|  | Upstream Bio, Inc. |  |  | 
                Severe asthma 
               |  |  | 
                Phase 2 
               |  |  | 
                10/10/2024 
               |  | 
|  | HilleVax, Inc. |  |  | 
                Norovirus vaccine 
               |  |  | 
                Phase 2b 
               |  |  | 
                04/28/2022 
               |  | 
|  | CinCor Pharma, Inc. |  |  | 
                Hypertension 
               |  |  | 
                Phase 2 
               |  |  | 
                01/06/2022 
               |  | 
|  | Vera Therapeutics, Inc. |  |  | 
                Immunoglobulin A nephropathy 
               |  |  | 
                Phase 2b 
               |  |  | 
                05/13/2021 
               |  | 
|  | Reneo Pharmaceuticals, Inc. |  |  | 
                Primary mitochondrial myopathies 
               |  |  | 
                Phase 2b 
               |  |  | 
                04/08/2021 
               |  | 
|  | Spruce Biosciences, Inc. |  |  | 
                Classic congenital adrenal hyperplasia 
               |  |  | 
                Phase 2b 
               |  |  | 
                10/08/2020 
               |  | 
|  | Graybug Vision, Inc. |  |  | 
                Wet AMD 
               |  |  | 
                Phase 2b 
               |  |  | 
                09/24/2020 
               |  | 
|  | COMPASS Pathways plc |  |  | 
                Treatment-resistant depression 
               |  |  | 
                Phase 2b 
               |  |  | 
                09/17/2020 
               |  | 
|  | Athira Pharma, Inc. |  |  | 
                Alzheimer’s disease 
               |  |  | 
                Phase 2/3 
               |  |  | 
                09/17/2020 
               |  | 
|  | Lyra Therapeutics, Inc. |  |  | 
                Chronic rhinosinusitis 
               |  |  | 
                Phase 2 
               |  |  | 
                04/30/2020 
               |  | 
|  | IMARA Inc. |  |  | 
                Sickle cell disease 
               |  |  | 
                Phase 2a 
               |  |  | 
                03/11/2020 
               |  | 
|  | Lead Asset Targeting Idiopathic Pulmonary Fibrosis (IPF) |  | |||||||||
|  | Contineum Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 1b 
               |  |  | 
                04/04/2024 
               |  | 
|  | Galecto, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 2b 
               |  |  | 
                10/28/2020 
               |  | 
|  | Pliant Therapeutics, Inc. |  |  | 
                IPF 
               |  |  | 
                Phase 2a 
               |  |  | 
                06/02/2020
               |  | 
| 
                ($ in millions) 
               |  |  | 
                Diluted 
                 Pre-Money Equity Value |  |  | 
                Diluted 
                 Pre-Money Enterprise Value |  | ||||||
| 
                Maximum
               |  |  |  | $ | 693.0 |  |  |  |  | $ | 471.9 |  |  | 
| 
                75th Percentile
               |  |  |  | $ | 421.7 |  |  |  |  | $ | 271.3 |  |  | 
| 
                Mean
               |  |  |  | $ | 348.9 |  |  |  |  | $ | 256.3 |  |  | 
| 
                Median
               |  |  |  | $ | 314.6 |  |  |  |  | $ | 248.2 |  |  | 
| 
                25th Percentile
               |  |  |  | $ | 266.8 |  |  |  |  | $ | 195.4 |  |  | 
| 
                Minimum
               |  |  |  | $ | 150.8 |  |  |  |  | $ | 115.5 |  |  | 
| 
                ($ in millions) 
               |  |  | 
                Implied Equity 
                 Value of Tvardi |  | |||
| 
                Maximum
               |  |  |  | $ | 477.9 |  |  | 
| 
                75th Percentile
               |  |  |  | $ | 277.3 |  |  | 
| 
                Mean
               |  |  |  | $ | 262.3 |  |  | 
| 
                Median
               |  |  |  | $ | 254.2 |  |  | 
| 
                25th Percentile
               |  |  |  | $ | 201.4 |  |  | 
| 
                Minimum
               |  |  |  | $ | 121.5 |  |  | 
|  |  |  | 
                Minimum 
               |  |  | 
                25th
                 Percentile |  |  | 
                Median 
               |  |  | 
                Mean 
               |  |  | 
                75th
                 Percentile |  |  | 
                Maximum 
               |  | ||||||||||||||||||
| 
                Implied Exchange Ratio
               |  |  |  |  | 5.1384x |  |  |  |  |  | 8.6676x |  |  |  |  |  | 11.0046x |  |  |  |  |  | 11.3636x |  |  |  |  |  | 12.0294x |  |  |  |  |  | 20.9255x |  |  | 
| 
                Ownership Percentage of Cara stockholders in the Implied Post-Merger Company
               |  |  |  |  | 13.3% |  |  |  |  |  | 9.1% |  |  |  |  |  | 7.6% |  |  |  |  |  | 7.4% |  |  |  |  |  | 7.0% |  |  |  |  |  | 4.4% |  |  | 
|  |  |  | 
                Minimum 
               |  |  | 
                25th 
                 Percentile |  |  | 
                Median 
               |  |  | 
                Mean 
               |  |  | 
                75th 
                 Percentile |  |  | 
                Maximum 
               |  | ||||||||||||||||||
| 
                Implied Value Per Share of Tvardi Common Stock
               |  |  |  | $ | 2.13 |  |  |  |  | $ | 3.60 |  |  |  |  | $ | 4.57 |  |  |  |  | $ | 4.72 |  |  |  |  | $ | 5.00 |  |  |  |  | $ | 8.69 |  |  | 
| 
                Implied Value Per Share of Cara Common Stock
               |  |  |  | $ | 0.44 |  |  |  |  | $ | 0.73 |  |  |  |  | $ | 0.93 |  |  |  |  | $ | 0.96 |  |  |  |  | $ | 1.02 |  |  |  |  | $ | 1.77 |  |  | 
| Management Liquidation Analysis ($ and figures in millions; except per share data) |  |  |  |  |  |  |  | 
| 
                Ending Cash (as of 3/31/2025) 
               |  |  |  | $ | 30.4 |  |  | 
| 
                Less: Operating Expenses during Liquidation Period 
               |  |  |  | $ | (0.3) |  |  | 
| 
                3/31/25 Ending Cash, Net Future Operating Costs 
               |  |  |  | $ | 30.1 |  |  | 
| 
                Less: Expected Final Distribution 
               |  |  |  | $ | (0.5) |  |  | 
| 
                Initial Distribution (3/31/2025)
               |  |  |  | $ | 29.6 |  |  | 
| 
                Diluted Shares Outstanding (Using treasury stock method) 
               |  |  |  |  | 55.8 |  |  | 
| 
                Undiscounted Initial Distribution Per Share (3/31/25)
               |  |  |  | $ | 0.53 |  |  | 
| 
                Discounted Initial Distribution (Aggregate)
               |  |  |  | $ | 29.1 |  |  | 
| 
                Discounted Initial Distribution (Per Share)
               |  |  |  | $ | 0.52 |  |  | 
| 
                3/31/25 Ending Cash, Net Initial Distribution 
               |  |  |  | $ | 0.8 |  |  | 
| 
                Less: Operating Expenses during Liquidation Period 
               |  |  |  | $ | (0.3) |  |  | 
| 
                Cash Available to Distribute (3/31/2028)
               |  |  |  | $ | 0.5 |  |  | 
| 
                Diluted Shares Outstanding (Using Treasury Stock Method) 
               |  |  |  |  | 55.8 |  |  | 
| 
                Undiscounted Final Distribution Per Share (3/31/2028)
               |  |  |  | $ | 0.01 |  |  | 
| 
                Discounted Final Distribution (Aggregate) 
               |  |  |  | $ | 0.4 |  |  | 
| 
                Discounted Final Distribution (Per Share) 
               |  |  |  | $ | 0.01 |  |  | 
| 
                Total Present Value of Distributions (Aggregate)
               |  |  |  | $ | 29.6 |  |  | 
| 
                Total Present Value of Distribution (Per Share)
               |  |  |  | $ | 0.53 |  |  | 
| 
                $ in thousands 
               |  |  | 
                November 2024 
               |  |  | 
                December 2024 
               |  |  | 
                January 2025 
               |  |  | 
                February 2025 
               |  |  | 
                March 2025(1)
               |  | |||||||||||||||
| 
                Beginning cash
               |  |  |  | $ | 41,300 |  |  |  |  | $ | 39,459 |  |  |  |  | $ | 36,471 |  |  |  |  | $ | 34,396 |  |  |  |  | $ | 31,605 |  |  | 
| 
                Expenses
               |  |  |  | $ | 1,841 |  |  |  |  | $ | 2,987 |  |  |  |  | $ | 2,075 |  |  |  |  | $ | 2,791 |  |  |  |  | $ | 8,422 |  |  | 
| 
                Ending cash
               |  |  |  | $ | 39,459 |  |  |  |  | $ | 36,471 |  |  |  |  | $ | 34,396 |  |  |  |  | $ | 31,605 |  |  |  |  | $ | 23,183 |  |  | 
| 
                Name 
               |  |  | 
                Cash
                 ($)(1) |  |  | 
                Equity
                 ($)(2) |  |  | 
                Perquisites/ Benefits ($)(3) |  |  | 
                Total
                 ($) |  | ||||||||||||
| 
                Chris Posner 
               |  |  |  |  | 2,184 |  |  |  |  |  | 21 |  |  |  |  |  | 183 |  |  |  |  |  | 2,388 |  |  | 
| 
                Ryan Maynard 
               |  |  |  |  | 860 |  |  |  |  |  | 0 |  |  |  |  |  | 105 |  |  |  |  |  | 965 |  |  | 
| 
                Scott Terrillion
               |  |  |  |  | 860 |  |  |  |  |  | 3 |  |  |  |  |  | 105 |  |  |  |  |  | 968 |  |  | 
| 
                Name 
               |  |  | 
                Number of Cara 
                 Shares Subject to Equity Award (#) |  |  | 
                Per Share Value of 
                 Executive Equity Award ($) |  |  | 
                Total 
               |  | |||||||||
| 
                Chris Posner 
               |  |  |  |  | 4,041 |  |  |  |  |  | 5.29 |  |  |  |  | $ | 21,376.89 |  |  | 
| 
                Ryan Maynard 
               |  |  |  |  | 0 |  |  |  |  |  | 5.29 |  |  |  |  | $ | 0 |  |  | 
| 
                Scott Terrillion
               |  |  |  |  | 555 |  |  |  |  |  | 5.29 |  |  |  |  | $ | 2,935.95 |  |  | 
|  |  |  | 
                Option Awards 
               |  | |||||||||||||||||||||
| 
                Name 
               |  |  | 
                Vesting 
                 Commencement Date |  |  | 
                Number of
                 Securities Underlying Unexercised Options Exercisable (#) |  |  | 
                Number of
                 Securities Underlying Unexercised Options Unexercisable (#) |  |  | 
                Option
                 Exercise Price ($) |  |  | 
                Option
                 Expiration Date |  | |||||||||
| 
                Christopher Posner 
               |  |  | 
                8/2/2018(1)
               |  |  |  |  | 2,916 |  |  |  |  |  | 0 |  |  |  |  |  | 215.28 |  |  |  | 
                8/2/2028 
               |  | 
|  | 
                6/4/2019(2)
               |  |  |  |  | 750 |  |  |  |  |  | 0 |  |  |  |  |  | 245.64 |  |  |  | 
                6/4/2029 
               |  | ||
|  | 
                6/4/2020(2)
               |  |  |  |  | 900 |  |  |  |  |  | 0 |  |  |  |  |  | 187.44 |  |  |  | 
                6/4/2030 
               |  | ||
|  | 
                6/3/2021(2)
               |  |  |  |  | 900 |  |  |  |  |  | 0 |  |  |  |  |  | 156.72 |  |  |  | 
                6/3/2031 
               |  | ||
|  | 
                10/29/2021(3)
               |  |  |  |  | 1,485 |  |  |  |  |  | 495 |  |  |  |  |  | 201.96 |  |  |  | 
                10/29/2031 
               |  | ||
|  | 
                10/29/2021(3)
               |  |  |  |  | 33,889 |  |  |  |  |  | 11,296 |  |  |  |  |  | 201.96 |  |  |  | 
                10/29/2031 
               |  | ||
|  | 
                2/25/2022(4)
               |  |  |  |  | 0 |  |  |  |  |  | 420 |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  | ||
|  | 
                2/25/2022(4)
               |  |  |  |  | 7,142 |  |  |  |  |  | 2,520 |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 0 |  |  |  |  |  | 1,219 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 9,548 |  |  |  |  |  | 10,065 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
| 
                Ryan Maynard 
               |  |  | 
                9/12/2022(5)
               |  |  |  |  | 1,550 |  |  |  |  |  | 1,550 |  |  |  |  |  | 129.00 |  |  |  | 
                9/12/2032 
               |  | 
|  | 
                9/12/2022(5)
               |  |  |  |  | 8,998 |  |  |  |  |  | 6,652 |  |  |  |  |  | 129.00 |  |  |  | 
                9/12/2032 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 0 |  |  |  |  |  | 421 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 3,093 |  |  |  |  |  | 3,234 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
| 
                Scott Terrillion 
               |  |  | 
                11/28/2016(5)
               |  |  |  |  | 3,615 |  |  |  |  |  | 0 |  |  |  |  |  | 110.64 |  |  |  | 
                11/28/2026 
               |  | 
|  | 
                11/28/2016(5)
               |  |  |  |  | 7,635 |  |  |  |  |  | 0 |  |  |  |  |  | 110.64 |  |  |  | 
                11/28/2026 
               |  | ||
|  | 
                3/9/2018(4)
               |  |  |  |  | 821 |  |  |  |  |  | 0 |  |  |  |  |  | 172.68 |  |  |  | 
                3/9/2028 
               |  | ||
|  | 
                3/9/2018(4)
               |  |  |  |  | 3,053 |  |  |  |  |  | 0 |  |  |  |  |  | 172.68 |  |  |  | 
                3/9/2028 
               |  | ||
|  | 
                3/6/2019(4)
               |  |  |  |  | 691 |  |  |  |  |  | 0 |  |  |  |  |  | 193.20 |  |  |  | 
                3/6/2029 
               |  | ||
|  | 
                3/6/2019(4)
               |  |  |  |  | 5,558 |  |  |  |  |  | 0 |  |  |  |  |  | 193.20 |  |  |  | 
                3/6/2029 
               |  | ||
|  | 
                2/24/2020(4)
               |  |  |  |  | 236 |  |  |  |  |  | 0 |  |  |  |  |  | 196.32 |  |  |  | 
                2/24/2030 
               |  | ||
|  | 
                2/24/2020(4)
               |  |  |  |  | 2,430 |  |  |  |  |  | 0 |  |  |  |  |  | 196.32 |  |  |  | 
                2/24/2030 
               |  | ||
|  | 
                3/30/2021(4)
               |  |  |  |  | 316 |  |  |  |  |  | 166 |  |  |  |  |  | 247.08 |  |  |  | 
                3/30/2031 
               |  | ||
|  | 
                3/30/2021(4)
               |  |  |  |  | 2,183 |  |  |  |  |  | 0 |  |  |  |  |  | 247.08 |  |  |  | 
                3/30/2031 
               |  | ||
|  | 
                2/25/2022(4)
               |  |  |  |  | 0 |  |  |  |  |  | 607 |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  | ||
|  | 
                2/25/2022(4)
               |  |  |  |  | 2,360 |  |  |  |  |  | 364 |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 3,093 |  |  |  |  |  | 2,550 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
|  | 
                3/1/2023(4)
               |  |  |  |  | 0 |  |  |  |  |  | 1,105 |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  | ||
|  |  |  | 
                Option Awards 
               |  | |||||||||||||||||||||
| 
                Name 
               |  |  | 
                Vesting 
                 Commencement Date |  |  | 
                Number of
                 Securities Underlying Unexercised Options Exercisable (#) |  |  | 
                Number of
                 Securities Underlying Unexercised Options Unexercisable (#) |  |  | 
                Option
                 Exercise Price ($) |  |  | 
                Option
                 Expiration Date |  | |||||||||
| 
                Martin Vogelbaum 
               |  |  | 
                6/8/2015(2)
               |  |  |  |  | 1,125 |  |  |  |  |  | 0 |  |  |  |  |  | 119.28 |  |  |  | 
                6/8/2025 
               |  | 
|  | 
                6/15/2016(2)
               |  |  |  |  | 1,250 |  |  |  |  |  | 0 |  |  |  |  |  | 63.84 |  |  |  | 
                6/15/2026 
               |  | ||
|  | 
                6/21/2017(2)
               |  |  |  |  | 1,250 |  |  |  |  |  | 0 |  |  |  |  |  | 234.00 |  |  |  | 
                6/21/2027 
               |  | ||
|  | 
                6/6/2018(2)
               |  |  |  |  | 1,500 |  |  |  |  |  | 0 |  |  |  |  |  | 192.84 |  |  |  | 
                6/6/2028 
               |  | ||
|  | 
                6/4/2019(2)
               |  |  |  |  | 750 |  |  |  |  |  | 0 |  |  |  |  |  | 245.64 |  |  |  | 
                6/4/2029 
               |  | ||
|  | 
                6/4/2020(2)
               |  |  |  |  | 1,800 |  |  |  |  |  | 0 |  |  |  |  |  | 187.44 |  |  |  | 
                6/4/2030 
               |  | ||
|  | 
                6/3/2021(2)
               |  |  |  |  | 1,800 |  |  |  |  |  | 0 |  |  |  |  |  | 156.72 |  |  |  | 
                6/3/2031 
               |  | ||
|  | 
                6/2/2022(2)
               |  |  |  |  | 2,823 |  |  |  |  |  | 0 |  |  |  |  |  | 101.04 |  |  |  | 
                6/3/2032 
               |  | ||
|  | 
                6/1/2023(2)
               |  |  |  |  | 7,493 |  |  |  |  |  | 0 |  |  |  |  |  | 37.08 |  |  |  | 
                6/1/2033 
               |  | ||
|  | 
                6/4/2024(6)
               |  |  |  |  | 0 |  |  |  |  |  | 32,500 |  |  |  |  |  | 7.92 |  |  |  | 
                6/4/2034 
               |  | ||
| 
                Jeffrey L. Ives, Ph.D. 
               |  |  | 
                6/8/2015(2)
               |  |  |  |  | 1,125 |  |  |  |  |  | 0 |  |  |  |  |  | 119.28 |  |  |  | 
                6/8/2025 
               |  | 
|  | 
                6/15/2016(2)
               |  |  |  |  | 1,250 |  |  |  |  |  | 0 |  |  |  |  |  | 63.84 |  |  |  | 
                6/15/2026 
               |  | ||
|  | 
                6/21/2017(2)
               |  |  |  |  | 1,250 |  |  |  |  |  | 0 |  |  |  |  |  | 234.00 |  |  |  | 
                6/21/2027 
               |  | ||
|  | 
                6/6/2018(2)
               |  |  |  |  | 1,500 |  |  |  |  |  | 0 |  |  |  |  |  | 192.84 |  |  |  | 
                6/6/2028 
               |  | ||
|  | 
                6/4/2019(2)
               |  |  |  |  | 750 |  |  |  |  |  | 0 |  |  |  |  |  | 245.64 |  |  |  | 
                6/4/2029 
               |  | ||
|  | 
                6/4/2020(2)
               |  |  |  |  | 900 |  |  |  |  |  | 0 |  |  |  |  |  | 187.44 |  |  |  | 
                6/4/2030 
               |  | ||
|  | 
                6/3/2021(2)
               |  |  |  |  | 900 |  |  |  |  |  | 0 |  |  |  |  |  | 156.72 |  |  |  | 
                6/3/2031 
               |  | ||
|  | 
                6/2/2022(2)
               |  |  |  |  | 1,416 |  |  |  |  |  | 0 |  |  |  |  |  | 101.04 |  |  |  | 
                6/3/2032 
               |  | ||
|  | 
                6/1/2023(2)
               |  |  |  |  | 3,746 |  |  |  |  |  | 0 |  |  |  |  |  | 37.08 |  |  |  | 
                6/1/2033 
               |  | ||
|  | 
                6/4/2024(6)
               |  |  |  |  | 0 |  |  |  |  |  | 16,250 |  |  |  |  |  | 7.92 |  |  |  | 
                6/4/2034 
               |  | ||
| 
                Susan Shiff, Ph.D. 
               |  |  | 
                6/26/2020(7)
               |  |  |  |  | 3,166 |  |  |  |  |  | 0 |  |  |  |  |  | 204.36 |  |  |  | 
                6/4/2030 
               |  | 
|  | 
                6/3/2021(2)
               |  |  |  |  | 900 |  |  |  |  |  | 0 |  |  |  |  |  | 156.72 |  |  |  | 
                6/3/2031 
               |  | ||
|  | 
                6/2/2022(2)
               |  |  |  |  | 1,416 |  |  |  |  |  | 0 |  |  |  |  |  | 101.04 |  |  |  | 
                6/3/2032 
               |  | ||
|  | 
                6/1/2023(2)
               |  |  |  |  | 3,746 |  |  |  |  |  | 0 |  |  |  |  |  | 37.08 |  |  |  | 
                6/1/2033 
               |  | ||
|  | 
                6/4/2024(6)
               |  |  |  |  | 0 |  |  |  |  |  | 16,250 |  |  |  |  |  | 7.92 |  |  |  | 
                6/4/2034 
               |  | ||
| 
                Lisa von Moltke, M.D. 
               |  |  | 
                1/2/2023(7)
               |  |  |  |  | 2,546 |  |  |  |  |  | 1,273 |  |  |  |  |  | 128.88 |  |  |  | 
                1/2/2033 
               |  | 
|  | 
                6/1/2023(2)
               |  |  |  |  | 3,746 |  |  |  |  |  | 0 |  |  |  |  |  | 37.08 |  |  |  | 
                6/1/2033 
               |  | ||
|  | 
                6/4/2024(6)
               |  |  |  |  | 0 |  |  |  |  |  | 16,250 |  |  |  |  |  | 7.92 |  |  |  | 
                6/4/2034 
               |  | ||
| 
                Helen M. Boudreau 
               |  |  | 
                8/2/2023(7)
               |  |  |  |  | 5,407 |  |  |  |  |  | 7,571 |  |  |  |  |  | 37.08 |  |  |  | 
                8/2/2033 
               |  | 
|  | 
                6/4/2024(6)
               |  |  |  |  | 0 |  |  |  |  |  | 16,250 |  |  |  |  |  | 7.92 |  |  |  | 
                6/4/2034
               |  | ||
| 
                Name 
               |  |  | 
                Vesting
                 Commencement Date |  |  | 
                Number of
                 Shares of Cara Common Stock Underlying Unvested RSUs that will Vest upon the Consummation of the Merger (#) |  | |||
| 
                Christopher Posner 
               |  |  | 
                10/29/2021 
               |  |  |  |  | 2,958 |  |  | 
|  | 
                2/25/2022 
               |  |  |  |  | 1,083 |  |  | ||
| 
                Scott Terrillion 
               |  |  | 
                2/25/2022 
               |  |  |  |  | 555 |  |  | 
| 
                Martin Vogelbaum 
               |  |  | 
                6/4/2024 
               |  |  |  |  | 25,107 |  |  | 
| 
                Jeffrey L. Ives, Ph.D. 
               |  |  | 
                6/4/2024 
               |  |  |  |  | 12,553 |  |  | 
| 
                Susan Shiff, Ph.D. 
               |  |  | 
                6/4/2024 
               |  |  |  |  | 12,553 |  |  | 
| 
                Lisa von Moltke, M.D. 
               |  |  | 
                6/4/2024 
               |  |  |  |  | 12,553 |  |  | 
| 
                Helen M. Boudreau 
               |  |  | 
                6/4/2024 
               |  |  |  |  | 12,553 |  |  | 
| 
                Name 
               |  |  | 
                Position with the 
                 Combined Company |  |  | 
                Current Position at Tvardi 
               |  | 
| Imran Alibhai, Ph.D. |  |  | Chief Executive Officer and Director |  |  | Chief Executive Officer and Director |  | 
| Dan Conn, J.D., M.B.A. |  |  | Chief Financial Officer |  |  | Chief Financial Officer |  | 
| John Kauh, M.D. |  |  | Chief Medical Officer |  |  | Chief Medical Officer |  | 
| Jeffrey Larson, Ph.D., DABT |  |  | Senior Vice President, Research & Development |  |  | Senior Vice President, Research & Development |  | 
| Yixin “Joseph” Chen, Ph.D. |  |  | Vice President, Chemistry, Manufacturing and Controls |  |  | Vice President, Chemistry, Manufacturing and Controls |  | 
|  |  |  |  |  |  |  |  |  | 
                Post-Merger Ownership 
               |  | |||||||||||||||
| Cara Net Cash at Closing ($ in millions) |  |  | 
                Exchange
                 Ratio |  |  | 
                Cara Equity
                 Holders |  |  | 
                Tvardi Equity
                 Holders |  |  | 
                Holders of
                 Convertible Notes |  | ||||||||||||
| 
                $20 million 
               |  |  |  |  | 0.2189 |  |  |  |  |  | 14.37% |  |  |  |  |  | 72.96% |  |  |  |  |  | 12.66% |  |  | 
| 
                $20.5 million 
               |  |  |  |  | 0.2162 |  |  |  |  |  | 14.53% |  |  |  |  |  | 72.83% |  |  |  |  |  | 12.64% |  |  | 
| 
                $21 million 
               |  |  |  |  | 0.2135 |  |  |  |  |  | 14.68% |  |  |  |  |  | 72.70% |  |  |  |  |  | 12.62% |  |  | 
| 
                $21.5 million 
               |  |  |  |  | 0.2110 |  |  |  |  |  | 14.83% |  |  |  |  |  | 72.57% |  |  |  |  |  | 12.60% |  |  | 
| 
                $22 million 
               |  |  |  |  | 0.2085 |  |  |  |  |  | 14.98% |  |  |  |  |  | 72.44% |  |  |  |  |  | 12.58% |  |  | 
| 
                $22.5 million 
               |  |  |  |  | 0.2060 |  |  |  |  |  | 15.13% |  |  |  |  |  | 72.31% |  |  |  |  |  | 12.56% |  |  | 
|  |  |  |  |  |  |  |  |  | 
                Post-Merger Ownership 
               |  | |||||||||||||||
| Cara Net Cash at Closing ($ in millions) |  |  | 
                Exchange
                 Ratio |  |  | 
                Cara Equity
                 Holders |  |  | 
                Tvardi Equity
                 Holders |  |  | 
                Holders of
                 Convertible Notes |  | ||||||||||||
| 
                $23.0 million 
               |  |  |  |  | 0.2042 |  |  |  |  |  | 15.25% |  |  |  |  |  | 72.21% |  |  |  |  |  | 12.54% |  |  | 
| 
                $23.5 million 
               |  |  |  |  | 0.2024 |  |  |  |  |  | 15.36% |  |  |  |  |  | 72.12% |  |  |  |  |  | 12.52% |  |  | 
| 
                $24.0 million 
               |  |  |  |  | 0.2001 |  |  |  |  |  | 15.51% |  |  |  |  |  | 71.99% |  |  |  |  |  | 12.50% |  |  | 
| 
                $24.5 million 
               |  |  |  |  | 0.1979 |  |  |  |  |  | 15.66% |  |  |  |  |  | 71.86% |  |  |  |  |  | 12.48% |  |  | 
| 
                $25.0 million 
               |  |  |  |  | 0.1957 |  |  |  |  |  | 15.81% |  |  |  |  |  | 71.73% |  |  |  |  |  | 12.46% |  |  | 
| 
                Plan Category 
               |  |  | 
                Number of securities to
                 be issued upon exercise of outstanding options, warrants and rights |  |  | 
                Weighted average 
                 exercise price of outstanding options, warrants and rights(2) |  |  | 
                Number of securities 
                 remaining available for future issuance under equity compensation plans (excluding securities in first column)(3) |  | |||||||||
| 
                Equity compensation plans approved by security holders(1)
               |  |  |  |  | 420,373 |  |  |  |  | $ | 86.35 |  |  |  |  |  | 494,275 |  |  | 
| 
                Equity compensation plans not approved by security holders 
               |  |  |  |  | — |  |  |  |  | $ | — |  |  |  |  |  | 25,000(4) |  |  | 
| 
                Total 
               |  |  |  |  | 420,373 |  |  |  |  | $ | 86.35 |  |  |  |  |  | 519,275 |  |  | 
|  |  |  | 
                Prior to Reverse
                 Stock Split |  |  | 
                After 1-for-2
                 Reverse Stock Split |  |  | 
                After 1-for-4
                 Reverse Stock Split |  | |||||||||
| 
                Common stock outstanding 
               |  |  |  |  | 4,571,229 |  |  |  |  |  | 2,285,614 |  |  |  |  |  | 1,142,807 |  |  | 
| 
                Common stock issuable pursuant to outstanding equity awards(1)
               |  |  |  |  | 519,275 |  |  |  |  |  | 259,637 |  |  |  |  |  | 129,818 |  |  | 
| 
                Product 
               |  |  | 
                Indication 
               |  |  | 
                Status 
               |  |  | 
                Next Milestone 
               |  |  | 
                Commercialization 
                 Rights |  | 
| KORSUVA (difelikefalin) injection/Kapruvia |  |  | Pruritus CKD – Hemodialysis |  |  | 
                Approved in the U.S. (08/2021)
               
                Approved in EU incl. UK (04/2022)
               
                Approved in Japan (09/2023)
               
                Other approvals: Switzerland, Canada, Singapore, Australia, Kuwait, Israel, UAE, Saudi Arabia 
               |  |  |  |  |  | 
                CSL Vifor (Worldwide excl. Japan and South Korea)*
               
                Maruishi (Japan)
               
                CKDP (South Korea)
               |  | 
![[MISSING IMAGE: fc_pipeline-4clr.jpg]](fc_pipeline-4clr.jpg) 
        ![[MISSING IMAGE: fc_canonical-4clr.jpg]](fc_canonical-4clr.jpg) 
        ![[MISSING IMAGE: fc_dualmechanism-4clr.jpg]](fc_dualmechanism-4clr.jpg) 
        ![[MISSING IMAGE: fc_centralcatalyst-4clr.jpg]](fc_centralcatalyst-4clr.jpg) 
        ![[MISSING IMAGE: fc_currentpipeline-4clr.jpg]](fc_currentpipeline-4clr.jpg) 
        ![[MISSING IMAGE: fc_ipfaffected-4clr.jpg]](fc_ipfaffected-4clr.jpg) 
        | Fibrosis- driven Disease |  |  | 
                Mouse Models 
               |  |  | 
                Observations of TTI-101 Administration 
               |  | 
| 
                IPF
               |  |  | BLM-induced IPF |  |  | 
                •
                 
                Observed histologic reduction in lung fibrosis, quantified using Ashcroft score and Masson’s trichrome from murine lung tissues, and increased BLM-induced decline in lung function, measured by percent or SO2
                
                •
                 
                Targeted multiple pathogenic steps as evidenced by decreased BLM-induced expression levels of validated biomarkers for deposition; increased BLM-reduced expression levels validated biomarkers for degradation as measured by transcripts from isolated RNA and relative real time polymerase reaction (RT-PCR)
                
                •
                 
                Observed accumulation of TTI-101 concentration in lung in comparison to plasma concentration measured by LC/MS/MS
                
                •
                 
                Reduced levels of pY-STAT3 in lung tissue 
                |  | 
| 
                SSc
               |  |  | GEM (Tsk-1) and BLM-induced skin fibrosis |  |  | 
                •
                 
                Observed a reduction in BLM-induced expression of validated biomarkers for fibrosis, including Col1, TGF-β and IL-6 as measured as measured by transcripts from isolated RNA and relative RT-PCR
                
                •
                 
                Reduced levels of pY-STAT3 in skin tissue as measured by Western blot bands quantified by Image J analysis
                
                •
                 
                Decreased skin thickness, a measure of fibrosis (p≤0.05 Tks-1 vs. TTI-101), measured by histological examination of skin sections stained with H&E and Masson’s trichome 
                |  | 
| 
                HCC
               |  |  | NASH-induced HCC |  |  | 
                •
                 
                Reduced elevated hepatic enzymes and microsteatosis, or abnormal liver fat accumulation, reduced hepatic fibrosis, measured by Masson’s trichrome staining and reduced tumor growth by comparing the average tumor volume determined by MRI 
                |  | 
| Fibrosis- driven Disease |  |  | 
                Mouse Models 
               |  |  | 
                Observations of TTI-101 Administration 
               |  | 
|  |  |  | Humanized mice + patient derived HCC xenografts |  |  | 
                •
                 
                Reduced tumor size with monotherapy, as measured by tumor weight
                
                •
                 
                Observed additive effect in reducing tumor size, as measured by tumor weight, with TTI-101 in combination with HCC standard of care therapies
                |  | 
![[MISSING IMAGE: fc_lungfibrosis-4clr.jpg]](fc_lungfibrosis-4clr.jpg) 
        ![[MISSING IMAGE: bc_bothextrinsic-4clr.jpg]](bc_bothextrinsic-4clr.jpg) 
        ![[MISSING IMAGE: bc_dosedepen-4clr.jpg]](bc_dosedepen-4clr.jpg) 
        ![[MISSING IMAGE: fc_evaluating-4clr.jpg]](fc_evaluating-4clr.jpg) 
        ![[MISSING IMAGE: fc_mousemodel-4clr.jpg]](fc_mousemodel-4clr.jpg) 
        ![[MISSING IMAGE: fc_engrafted-4clr.jpg]](fc_engrafted-4clr.jpg) 
        |  |  |  | 
                Patients with 
                 HCC (N=17) n (%) |  |  | 
                All Patients with
                 Advanced Solid Tumors (N=41) n (%) |  | 
| 
                Confirmed partial response(1)
               |  |  | 
                3 (18) 
               |  |  | 
                  5 (12)* 
               |  | 
| 
                Stable disease(2)
               |  |  | 
                6 (35) 
               |  |  | 
                17 (41) 
               |  | 
| 
                Progressive disease(3)
               |  |  | 
                8 (47) 
               |  |  | 
                19 (46) 
               |  | 
| 
                Disease Control Rate(4)
               |  |  | 
                53% 
               |  |  | 
                54% 
               |  | 
| 
                Median Number of Therapies 
               |  |  | 
                2 
               |  |  | 
                3.5
               |  | 
![[MISSING IMAGE: lc_treatment-4clr.jpg]](lc_treatment-4clr.jpg) 
        ![[MISSING IMAGE: fc_clinicaltrial-4clr.jpg]](fc_clinicaltrial-4clr.jpg) 
        | 
                Product 
               |  |  | 
                Indication 
               |  |  | 
                Status 
               |  |  | 
                Next Milestone 
               |  |  | 
                Commercialization Rights 
               |  | 
| KORSUVA (difelikefalin) injection/Kapruvia |  |  | Pruritus CKD — Hemodialysis |  |  | 
                Approved in the U.S. (08/2021)
               
                Approved in EU incl. UK (04/2022)
               
                Approved in Japan (09/2023)
               
                Other approvals: Switzerland, Canada, Singapore, Australia, Kuwait, Israel, UAE, Saudi Arabia 
               |  |  |  |  |  | 
                CSL Vifor (Worldwide excl. Japan and South Korea)*
               
                Maruishi (Japan)
               
                CKDP (South Korea)
               |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  | ||||||||||||||||||
| 
                Collaborative revenue 
               |  |  |  | $ | 1,298 |  |  |  |  | $ | 2,471 |  |  |  | 
                -47% 
               |  |  |  | $ | 2,086 |  |  |  |  | $ | 10,631 |  |  |  | 
                -80% 
               |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | — |  |  |  |  |  | 1,252 |  |  |  | 
                -100% 
               |  |  |  |  | 640 |  |  |  |  |  | 5,843 |  |  |  | 
                -89% 
               |  | 
| 
                License and milestone fees 
               |  |  |  |  | — |  |  |  |  |  | 910 |  |  |  | 
                -100% 
               |  |  |  |  | — |  |  |  |  |  | 910 |  |  |  | 
                -100% 
               |  | 
| 
                Royalty revenue 
               |  |  |  |  | — |  |  |  |  |  | 167 |  |  |  | 
                -100% 
               |  |  |  |  | — |  |  |  |  |  | 415 |  |  |  | 
                -100% 
               |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | — |  |  |  |  |  | 66 |  |  |  | 
                -100% 
               |  |  |  |  | 84 |  |  |  |  |  | 165 |  |  |  | 
                -49% 
               |  | 
| 
                Other revenue 
               |  |  |  |  | 1,258 |  |  |  |  |  | — |  |  |  | 
                N/A 
               |  |  |  |  | 2,872 |  |  |  |  |  | — |  |  |  | 
                N/A 
               |  | 
| 
                Total revenue 
               |  |  |  | $ | 2,556 |  |  |  |  | $ | 4,866 |  |  |  | 
                -47% 
               |  |  |  | $ | 5,682 |  |  |  |  | $ | 17,964 |  |  |  | 
                -68%
               |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Cost of Goods Sold 
               |  |  |  | $ | — |  |  |  |  | $ | 1,558 |  |  |  |  |  | -100% |  |  |  |  | $ | 620 |  |  |  |  | $ | 5,566 |  |  |  |  |  | -89% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Direct clinical trial costs 
               |  |  |  | $ | 1,444 |  |  |  |  | $ | 16,210 |  |  |  |  |  | -91% |  |  |  |  | $ | 22,905 |  |  |  |  | $ | 50,496 |  |  |  |  |  | -55% |  |  | 
| 
                Consultant services in support of clinical trials 
               |  |  |  |  | 7 |  |  |  |  |  | 1,381 |  |  |  |  |  | -99% |  |  |  |  |  | 1,076 |  |  |  |  |  | 3,810 |  |  |  |  |  | -72% |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | 16 |  |  |  |  |  | 1,477 |  |  |  |  |  | -99% |  |  |  |  |  | 1,044 |  |  |  |  |  | 4,699 |  |  |  |  |  | -78% |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | — |  |  |  |  |  | 28 |  |  |  |  |  | -100% |  |  |  |  |  | 50 |  |  |  |  |  | 86 |  |  |  |  |  | -42% |  |  | 
| 
                Other R&D operating expenses 
               |  |  |  |  | (105) |  |  |  |  |  | 6,355 |  |  |  |  |  | -102% |  |  |  |  |  | 7,559 |  |  |  |  |  | 21,004 |  |  |  |  |  | -64% |  |  | 
| 
                Total R&D expense 
               |  |  |  | $ | 1,362 |  |  |  |  | $ | 25,451 |  |  |  |  |  | -95% |  |  |  |  | $ | 32,634 |  |  |  |  | $ | 80,095 |  |  |  |  |  | -59% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                External research and development expenses: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Oral difelikefalin – Pruritus 
               |  |  |  | $ | 1,451 |  |  |  |  | $ | 17,564 |  |  |  |  |  | -92% |  |  |  |  | $ | 23,963 |  |  |  |  | $ | 54,239 |  |  |  |  |  | -56% |  |  | 
| 
                Internal research and development expenses 
               |  |  |  |  | (89) |  |  |  |  |  | 7,887 |  |  |  |  |  | -101% |  |  |  |  |  | 8,671 |  |  |  |  |  | 25,856 |  |  |  |  |  | -66% |  |  | 
| 
                Total research and development expenses 
               |  |  |  | $ | 1,362 |  |  |  |  | $ | 25,451 |  |  |  |  |  | -95% |  |  |  |  | $ | 32,634 |  |  |  |  | $ | 80,095 |  |  |  |  |  | -59% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Professional fees and public/investor 
                 relations |  |  |  | $ | 1,451 |  |  |  |  | $ | 1,485 |  |  |  |  |  | -2% |  |  |  |  | $ | 3,583 |  |  |  |  | $ | 4,925 |  |  |  |  |  | -27% |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | 1,473 |  |  |  |  |  | 1,857 |  |  |  |  |  | -21% |  |  |  |  |  | 5,531 |  |  |  |  |  | 5,429 |  |  |  |  |  | 2% |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | 73 |  |  |  |  |  | 31 |  |  |  |  |  | 136% |  |  |  |  |  | 142 |  |  |  |  |  | 91 |  |  |  |  |  | 56% |  |  | 
| 
                Other G&A operating expenses 
               |  |  |  |  | 3,478 |  |  |  |  |  | 3,382 |  |  |  |  |  | 3% |  |  |  |  |  | 10,443 |  |  |  |  |  | 10,746 |  |  |  |  |  | -3% |  |  | 
| 
                Total G&A expense 
               |  |  |  | $ | 6,475 |  |  |  |  | $ | 6,755 |  |  |  |  |  | -4% |  |  |  |  | $ | 19,699 |  |  |  |  | $ | 21,191 |  |  |  |  |  | -7% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Restructuring expenses 
               |  |  |  | $ | 707 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  |  |  | $ | 5,689 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Other income, net 
               |  |  |  | $ | 766 |  |  |  |  | $ | 866 |  |  |  |  |  | -12% |  |  |  |  | $ | 2,407 |  |  |  |  | $ | 2,712 |  |  |  |  |  | -11% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Impairment of long-lived assets 
               |  |  |  | $ | 4,274 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  |  |  | $ | 4,274 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Inventory write-down 
               |  |  |  | $ | 1,020 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  |  |  | $ | 2,509 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  |  |  |  |  |  |  | 
                Nine Months Ended
                 September 30, |  |  |  |  |  |  |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                % change 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  |  | 
                Dollar amounts in thousands 
               |  |  |  |  |  |  |  | ||||||||||||||||||
| 
                Non-cash interest expense on liability related to sales of future royalties and milestones 
               |  |  |  | $ | 1,960 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  |  |  | $ | 5,852 |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | 
| 
                Collaborative revenue 
               |  |  |  | $ | 12,936 |  |  |  | 
                (22)% 
               |  |  |  | $ | 16,572 |  |  |  | 
                2,248% 
               |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | 5,843 |  |  |  | 
                (43)% 
               |  |  |  |  | 10,223 |  |  |  | 
                1,358% 
               |  | 
| 
                License and milestone fees 
               |  |  |  |  | 910 |  |  |  | 
                (94)% 
               |  |  |  |  | 15,000 |  |  |  | 
                (29)% 
               |  | 
| 
                Royalty revenue 
               |  |  |  |  | 415 |  |  |  | 
                476% 
               |  |  |  |  | 72 |  |  |  | 
                N/A 
               |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | 165 |  |  |  | 
                N/A 
               |  |  |  |  | — |  |  |  | 
                (100)% 
               |  | 
| 
                Other revenue 
               |  |  |  |  | 699 |  |  |  | 
                N/A 
               |  |  |  |  | — |  |  |  | 
                N/A 
               |  | 
| 
                Total revenue 
               |  |  |  | $ | 20,968 |  |  |  | 
                (50)% 
               |  |  |  | $ | 41,867 |  |  |  | 
                82%
               |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | ||||||
| 
                Cost of Goods Sold 
               |  |  |  | $ | 6,174 |  |  |  |  |  | (15)% |  |  |  |  | $ | 7,266 |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | ||||||
| 
                Direct clinical trial costs 
               |  |  |  | $ | 67,434 |  |  |  |  |  | 39% |  |  |  |  | $ | 48,668 |  |  |  |  |  | 56% |  |  | 
| 
                Consultant services in support of clinical trials 
               |  |  |  |  | 5,055 |  |  |  |  |  | (8)% |  |  |  |  |  | 5,467 |  |  |  |  |  | 16% |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | 6,449 |  |  |  |  |  | (19)% |  |  |  |  |  | 7,987 |  |  |  |  |  | (4)% |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | 129 |  |  |  |  |  | 8% |  |  |  |  |  | 120 |  |  |  |  |  | (3)% |  |  | 
| 
                Other R&D operating expenses 
               |  |  |  |  | 29,443 |  |  |  |  |  | (1)% |  |  |  |  |  | 29,637 |  |  |  |  |  | (23)% |  |  | 
| 
                Total R&D expense 
               |  |  |  | $ | 108,510 |  |  |  |  |  | 18% |  |  |  |  | $ | 91,879 |  |  |  |  |  | 11% |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | 
| External research and development expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                KORSUVA (difelikefalin) injection – Pruritus 
               |  |  |  | $ | — |  |  |  | 
                (100)% 
               |  |  |  | $ | 6,692 |  |  |  | 
                (31)% 
               |  | 
| 
                Oral difelikefalin – Pruritus 
               |  |  |  |  | 72,475 |  |  |  | 
                52% 
               |  |  |  |  | 47,814 |  |  |  | 
                86% 
               |  | 
| 
                Other 
               |  |  |  |  | — |  |  |  | 
                N/A 
               |  |  |  |  | — |  |  |  | 
                (100)% 
               |  | 
| 
                Internal research and development expenses/milestone payments(1)
               |  |  |  |  | 36,035 |  |  |  | 
                (4)% 
               |  |  |  |  | 37,373 |  |  |  | 
                (21)% 
               |  | 
| 
                Total research and development expenses 
               |  |  |  | $ | 108,510 |  |  |  | 
                18% 
               |  |  |  | $ | 91,879 |  |  |  | 
                11%
               |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | ||||||
| 
                Professional fees and public/investor relations 
               |  |  |  | $ | 6,228 |  |  |  |  |  | (1)% |  |  |  |  | $ | 6,322 |  |  |  |  |  | 36% |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | 7,281 |  |  |  |  |  | (25)% |  |  |  |  |  | 9,747 |  |  |  |  |  | (22)% |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | 130 |  |  |  |  |  | 2% |  |  |  |  |  | 128 |  |  |  |  |  | 3% |  |  | 
| 
                Other G&A operating expenses 
               |  |  |  |  | 14,140 |  |  |  |  |  | 1% |  |  |  |  |  | 14,060 |  |  |  |  |  | 15% |  |  | 
| 
                Total G&A expense 
               |  |  |  | $ | 27,779 |  |  |  |  |  | (8)% |  |  |  |  | $ | 30,257 |  |  |  |  |  | 3% |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | ||||||
| 
                Other income, net 
               |  |  |  | $ | 3,586 |  |  |  |  |  | 74% |  |  |  |  | $ | 2,061 |  |  |  |  |  | 221% |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||||||||||||||
|  |  |  |  |  |  |  |  |  | 
                % change 
               |  |  |  |  |  |  |  |  | 
                % change 
               |  | ||||||
| 
                Non-cash interest expense on liability related to sales of future royalties 
                 and milestones |  |  |  | $ | (604) |  |  |  |  |  | N/A |  |  |  |  | $ | — |  |  |  |  |  | N/A |  |  | 
|  |  |  | 
                Material Cash Requirements (amounts in thousands) 
               |  | |||||||||||||||||||||||||||||||||||||||
|  |  |  | 
                Total 
               |  |  | 
                2024 
               |  |  | 
                2025 
               |  |  | 
                2026 
               |  |  | 
                2027 
               |  |  | 
                2028 
               |  |  | 
                Thereafter 
               |  | |||||||||||||||||||||
| 
                Operating lease obligation(1)
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| 
                Manufacturing purchase obligations(2)
               |  |  |  |  | 1,509 |  |  |  |  |  | 1,509 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Other obligations(3)
               |  |  |  |  | 1,500 |  |  |  |  |  | 1,500 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total 
               |  |  |  | $ | 3,009 |  |  |  |  | $ | 3,009 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Nine Months Ended
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||
| 
                Net cash used in operating activities 
               |  |  |  | $ | (56,874) |  |  |  |  | $ | (74,708) |  |  | 
| 
                Net cash provided by investing activities 
               |  |  |  |  | 43,741 |  |  |  |  |  | 73,666 |  |  | 
| 
                Net cash (used in) provided by financing activities 
               |  |  |  |  | (1,989) |  |  |  |  |  | 1,676 |  |  | 
| 
                Net (decrease) increase in cash, cash equivalents and restricted cash 
               |  |  |  | $ | (15,122) |  |  |  |  | $ | 634 |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
|  |  |  | 
                Dollar amounts in thousands 
               |  | |||||||||
| 
                Net cash used in operating activities 
               |  |  |  | $ | (92,078) |  |  |  |  | $ | (78,730) |  |  | 
| 
                Net cash provided by (used in) investing activities 
               |  |  |  |  | 43,461 |  |  |  |  |  | 128,707 |  |  | 
| 
                Net cash provided by financing activities 
               |  |  |  |  | 38,151 |  |  |  |  |  | 311 |  |  | 
| 
                Net (decrease) increase in cash, cash equivalents and restricted cash 
               |  |  |  | $ | (10,466) |  |  |  |  | $ | 50,288 |  |  | 
|  |  |  | 
                Nine Months Ended
                 September 30, |  |  | 
                Change 
               |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                Amount 
               |  |  | 
                Percent 
               |  | ||||||||||||
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  | $ | 15,047 |  |  |  |  | $ | 11,884 |  |  |  |  | $ | 3,163 |  |  |  |  |  | 26.6% |  |  | 
| 
                General and administrative 
               |  |  |  |  | 2,258 |  |  |  |  |  | 2,117 |  |  |  |  |  | 141 |  |  |  |  |  | 6.7% |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 17,305 |  |  |  |  |  | 14,001 |  |  |  |  |  | 3,304 |  |  |  |  |  | 23.6% |  |  | 
| 
                Loss from operations 
               |  |  |  |  | (17,305) |  |  |  |  |  | (14,001) |  |  |  |  |  | (3,304) |  |  |  |  |  | 23.6% |  |  | 
| 
                Interest income 
               |  |  |  |  | 615 |  |  |  |  |  | 1,005 |  |  |  |  |  | (390) |  |  |  |  |  | (38.8)% |  |  | 
| 
                Net loss 
               |  |  |  | $ | (16,690) |  |  |  |  | $ | (12,996) |  |  |  |  | $ | (3,694) |  |  |  |  |  | 28.4% |  |  | 
|  |  |  | 
                Nine Months Ended
                 September 30, |  |  | 
                Change 
               |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                Amount 
               |  |  | 
                Percent 
               |  | ||||||||||||
| Direct research and development expenses by program: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                TTI-101:
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                HCC 
               |  |  |  | $ | 4,996 |  |  |  |  | $ | 1,239 |  |  |  |  | $ | 3,757 |  |  |  |  |  | 303.2% |  |  | 
| 
                IPF 
               |  |  |  |  | 2,991 |  |  |  |  |  | 2,828 |  |  |  |  |  | 163 |  |  |  |  |  | 5.8% |  |  | 
| 
                mBC 
               |  |  |  |  | 2,771 |  |  |  |  |  | 456 |  |  |  |  |  | 2,315 |  |  |  |  |  | 507.7% |  |  | 
| 
                Pre-clinical, CMC, and other (unallocated) 
               |  |  |  |  | 715 |  |  |  |  |  | 3,340 |  |  |  |  |  | (2,625) |  |  |  |  |  | (78.6)% |  |  | 
| 
                TTI-109 
               |  |  |  |  | 697 |  |  |  |  |  | 870 |  |  |  |  |  | (173) |  |  |  |  |  | (19.9)% |  |  | 
| Unallocated research and development expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Personnel costs (including stock-based compensation) 
               |  |  |  |  | 2,273 |  |  |  |  |  | 2,199 |  |  |  |  |  | 74 |  |  |  |  |  | 3.4% |  |  | 
| 
                Consultant fees and other costs 
               |  |  |  |  | 604 |  |  |  |  |  | 952 |  |  |  |  |  | (348) |  |  |  |  |  | (36.6)% |  |  | 
| 
                Total research and development expenses 
               |  |  |  | $ | 15,047 |  |  |  |  | $ | 11,884 |  |  |  |  | $ | 3,163 |  |  |  |  |  | 26.6% |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  |  | 
                Change 
               |  | ||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                Amount 
               |  |  | 
                Percent 
               |  | ||||||||||||
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  | $ | 15,866 |  |  |  |  | $ | 18,466 |  |  |  |  | $ | (2,600) |  |  |  |  |  | (14.1)% |  |  | 
| 
                General and administrative 
               |  |  |  |  | 2,799 |  |  |  |  |  | 2,727 |  |  |  |  |  | 72 |  |  |  |  |  | 2.6% |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 18,665 |  |  |  |  |  | 21,193 |  |  |  |  |  | (2,528) |  |  |  |  |  | (11.9)% |  |  | 
| 
                Loss from operations 
               |  |  |  |  | (18,665) |  |  |  |  |  | (21,193) |  |  |  |  |  | 2,528 |  |  |  |  |  | (11.9)% |  |  | 
| Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Interest income 
               |  |  |  |  | 1,318 |  |  |  |  |  | 654 |  |  |  |  |  | 664 |  |  |  |  |  | 101.5% |  |  | 
| 
                Interest expense 
               |  |  |  |  | — |  |  |  |  |  | (2) |  |  |  |  |  | 2 |  |  |  |  |  | (100.0)% |  |  | 
| 
                Total other income, net 
               |  |  |  |  | 1,318 |  |  |  |  |  | 652 |  |  |  |  |  | 666 |  |  |  |  |  | 102.1% |  |  | 
| 
                Net loss 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,541) |  |  |  |  | $ | 3,194 |  |  |  |  |  | (15.5)% |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  |  | 
                Change 
               |  | ||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                Amount 
               |  |  | 
                Percent 
               |  | ||||||||||||
| Direct research and development expenses by program: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                TTI-101:
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||
| 
                HCC 
               |  |  |  | $ | 2,127 |  |  |  |  | $ | 1,481 |  |  |  |  | $ | 646 |  |  |  |  |  | 43.6% |  |  | 
| 
                IPF
               |  |  |  |  | 3,210 |  |  |  |  |  | 2,378 |  |  |  |  |  | 832 |  |  |  |  |  | —% |  |  | 
| 
                mBC
               |  |  |  |  | 646 |  |  |  |  |  | 770 |  |  |  |  |  | (124) |  |  |  |  |  | (16.1)% |  |  | 
| 
                Pre-clinical, CMC, and other (unallocated)
               |  |  |  |  | 4,373 |  |  |  |  |  | 10,354 |  |  |  |  |  | (5,981) |  |  |  |  |  | (57.8%) |  |  | 
| 
                TTI-109 
               |  |  |  |  | 1,466 |  |  |  |  |  | 79 |  |  |  |  |  | 1,387 |  |  |  |  |  | 1755.7% |  |  | 
| Unallocated research and development expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Personnel costs (including stock-based compensation) 
               |  |  |  |  | 2,900 |  |  |  |  |  | 1,709 |  |  |  |  |  | 1,191 |  |  |  |  |  | 69.7% |  |  | 
| 
                Consultant fees and other costs 
               |  |  |  |  | 1,144 |  |  |  |  |  | 1,695 |  |  |  |  |  | (551) |  |  |  |  |  | (32.5)% |  |  | 
| 
                Total research and development expenses 
               |  |  |  | $ | 15,866 |  |  |  |  | $ | 18,466 |  |  |  |  | $ | (2,600) |  |  |  |  |  | (14.1)% |  |  | 
|  |  |  | 
                Nine Months Ended 
                 September 30, |  |  | 
                Year Ended December 31, 
               |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||
| 
                Net cash used in operating activities 
               |  |  |  | $ | (13,472) |  |  |  |  | $ | (15,291) |  |  |  |  | $ | (21,040) |  |  |  |  | $ | (17,866) |  |  | 
| 
                Net cash provided by (used in) investing activities 
               |  |  |  |  | — |  |  |  |  |  | 22,468 |  |  |  |  |  | 22,468 |  |  |  |  |  | (22,000) |  |  | 
| 
                Net cash (used in) provided by financing activities 
               |  |  |  |  | (9) |  |  |  |  |  | 2 |  |  |  |  |  | 2 |  |  |  |  |  | 4 |  |  | 
| 
                Net (decrease) increase in cash 
               |  |  |  | $ | (13,481) |  |  |  |  | $ | 7,179 |  |  |  |  | $ | 1,430 |  |  |  |  | $ | (39,862) |  |  | 
| 
                Grant Date 
               |  |  | 
                Number of
                 Shares Subject to Options Granted |  |  | 
                Per Share
                 Exercise Price of Options |  |  | 
                Per Share
                 Fair Value of Common Stock |  |  | 
                Per Share
                 Estimated Fair Value of Options |  | ||||||||||||
| 
                January 12, 2023 
               |  |  |  |  | 607,129 |  |  |  |  | $ | 0.82 |  |  |  |  | $ | 0.82 |  |  |  |  | $ | 0.52 |  |  | 
| 
                June 27, 2023 
               |  |  |  |  | 60,000 |  |  |  |  | $ | 0.82 |  |  |  |  | $ | 0.82(1) |  |  |  |  | $ | 0.52 |  |  | 
| 
                June 27, 2023 
               |  |  |  |  | 20,000 |  |  |  |  | $ | 0.82 |  |  |  |  | $ | 0.82(1) |  |  |  |  | $ | 0.53 |  |  | 
| 
                January 31, 2024 
               |  |  |  |  | 25,000 |  |  |  |  | $ | 0.92 |  |  |  |  | $ | 0.92 |  |  |  |  | $ | 0.62 |  |  | 
| 
                Name 
               |  |  | 
                Age 
               |  |  | 
                Position 
               |  | 
| Imran Alibhai, Ph.D. |  |  | 
                48 
               |  |  | Chief Executive Officer and Director |  | 
| Dan Conn, J.D., M.B.A. |  |  | 
                57 
               |  |  | Chief Financial Officer |  | 
| John Kauh, M.D. |  |  | 
                51 
               |  |  | Chief Medical Officer |  | 
| Jeffrey Larson, Ph.D., DABT |  |  | 
                63 
               |  |  | Senior Vice President, Research & Development |  | 
| Yixin “Joseph” Chen, Ph.D. |  |  | 
                64 
               |  |  | 
                Vice President, Chemistry, Manufacturing and Controls 
               |  | 
| Sujal Shah |  |  | 
                51 
               |  |  | Chairman of the Board |  | 
| Wallace Hall |  |  | 
                62 
               |  |  | Director |  | 
| Shaheen Wirk, M.D. |  |  | 
                47 
               |  |  | Director |  | 
| Michael Wygza |  |  | 
                69 
               |  |  | Director |  | 
| 
                Name and Principal Position 
               |  |  | 
                Year 
               |  |  | 
                Salary 
                 ($) |  |  | 
                Option 
                 awards ($)(1) |  |  | 
                Non-equity 
                 incentive plan compensation ($)(2) |  |  | 
                All other 
                 compensation ($)(3) |  |  | 
                Total 
                 ($) |  | ||||||||||||||||||
| 
                Christopher Posner
                 President and Chief Executive Officer |  |  |  |  | 2024 |  |  |  |  |  | 728,000 |  |  |  |  |  | 326,800 |  |  |  |  |  | — |  |  |  |  |  | 11,079 |  |  |  |  |  | 1,065,879 |  |  | 
|  |  |  | 2023 |  |  |  |  |  | 728,000 |  |  |  |  |  | 1,769,000 |  |  |  |  |  | 414,960 |  |  |  |  |  | 10,509 |  |  |  |  |  | 2,922,469 |  |  | ||
| 
                Ryan Maynard
                 Chief Financial Officer |  |  |  |  | 2024 |  |  |  |  |  | 478,400 |  |  |  |  |  | 117,800 |  |  |  |  |  | — |  |  |  |  |  | 11,079 |  |  |  |  |  | 607,279 |  |  | 
|  |  |  | 2023 |  |  |  |  |  | 478,400 |  |  |  |  |  | 573,156 |  |  |  |  |  | 181,792 |  |  |  |  |  | 10,509 |  |  |  |  |  | 1,243,857 |  |  | ||
| 
                Scott Terrillion(4)
                 General Counsel, Secretary and Chief Compliance Officer |  |  |  |  | 2024 |  |  |  |  |  | 463,840 |  |  |  |  |  | 117,800 |  |  |  |  |  | — |  |  |  |  |  | 11,217 |  |  |  |  |  | 592,857 |  |  | 
| 
                Named Executive Officer 
               |  |  | 
                Target 
                 Bonus % |  | |||
| 
                Christopher Posner 
               |  |  |  |  | 60% |  |  | 
| 
                Ryan Maynard 
               |  |  |  |  | 40% |  |  | 
| 
                Scott Terrillion 
               |  |  |  |  | 40% |  |  | 
| 
                Named Executive Officer 
               |  |  | 
                Performance-based 
                 Stock Option Grant (# shares)(1) |  | |||
| 
                Christopher Posner 
               |  |  |  |  | 35,833 |  |  | 
| 
                Ryan Maynard 
               |  |  |  |  | 12,917 |  |  | 
| 
                Scott Terrillion 
               |  |  |  |  | 12,917 |  |  | 
|  |  |  |  |  |  | 
                Option Awards 
               |  |  | 
                Stock Awards 
               |  | |||||||||||||||||||||||||||
| 
                Name
               |  |  | 
                Grant date 
               |  |  | 
                Number of 
                 securities underlying unexercised options (#) exercisable |  |  | 
                Number of 
                 securities underlying unexercised options (#) unexercisable |  |  | 
                Option 
                 exercise price ($) |  |  | 
                Option 
                 expiration date |  |  | 
                Number of 
                 shares or units of stock that have not vested (#)(1) |  |  | 
                Market 
                 value of shares or units of stock that have not vested ( $)(2) |  | |||||||||||||||
| 
                Christopher Posner
                 President and Chief Executive Officer |  |  | 
                8/2/2018 
               |  |  |  |  | 2,916 |  |  |  |  |  | — |  |  |  |  |  | 215.28 |  |  |  | 
                8/2/2028 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
|  | 
                6/4/2019 
               |  |  |  |  | 750 |  |  |  |  |  | — |  |  |  |  |  | 245.64 |  |  |  | 
                6/4/2029 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                6/4/2020 
               |  |  |  |  | 900 |  |  |  |  |  | — |  |  |  |  |  | 187.44 |  |  |  | 
                6/4/2030 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                6/3/2021 
               |  |  |  |  | 900 |  |  |  |  |  | — |  |  |  |  |  | 156.72 |  |  |  | 
                6/3/2031 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                10/29/2021 
               |  |  |  |  | 35,373 |  |  |  |  |  | 11,793(3) |  |  |  |  |  | 201.96 |  |  |  | 
                10/29/2031 
               |  |  |  |  | 2,956(4) |  |  |  |  |  | 18,090.72 |  |  | ||
|  | 
                2/25/2022 
               |  |  |  |  | 7,142 |  |  |  |  |  | 2,940(5) |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  |  |  |  | 1,083(6) |  |  |  |  |  | 6,627.96 |  |  | ||
|  | 
                3/1/2023 
               |  |  |  |  | 9,114 |  |  |  |  |  | 11,718(5) |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
| 
                Ryan Maynard
                 Chief Financial Officer |  |  | 
                9/12/2022 
               |  |  |  |  | 10,546 |  |  |  |  |  | 8,203(7) |  |  |  |  |  | 129.00 |  |  |  | 
                9/12/2032 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
|  | 
                3/1/2023 
               |  |  |  |  | 2,953 |  |  |  |  |  | 3,796(5) |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
| 
                Scott Terrillion
                 General Counsel, Secretary and Chief Compliance Officer |  |  | 
                11/28/2016 
               |  |  |  |  | 11,250 |  |  |  |  |  | — |  |  |  |  |  | 110.64 |  |  |  | 
                11/28/2026 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
|  | 
                3/9/2018 
               |  |  |  |  | 3,874 |  |  |  |  |  | — |  |  |  |  |  | 172.68 |  |  |  | 
                3/9/2028 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                3/6/2019 
               |  |  |  |  | 6,249 |  |  |  |  |  | — |  |  |  |  |  | 193.20 |  |  |  | 
                3/6/2029 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                2/24/2020 
               |  |  |  |  | 2,666 |  |  |  |  |  | — |  |  |  |  |  | 196.32 |  |  |  | 
                2/24/2030 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                3/30/2021 
               |  |  |  |  | 2,499 |  |  |  |  |  | 167(5) |  |  |  |  |  | 247.08 |  |  |  | 
                3/30/2031 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
|  | 
                2/25/2022 
               |  |  |  |  | 2,361 |  |  |  |  |  | 971(5) |  |  |  |  |  | 125.52 |  |  |  | 
                2/25/2032 
               |  |  |  |  | 555(6) |  |  |  |  |  | 3,396.60 |  |  | ||
|  | 
                3/1/2023 
               |  |  |  |  | 2,953 |  |  |  |  |  | 3,796(5) |  |  |  |  |  | 120.72 |  |  |  | 
                3/1/2033 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | ||
| 
                Director 
               |  |  | 
                Fees 
                 earned or paid in cash(1) ($) |  |  | 
                Stock 
                 awards(2)(3) ($) |  |  | 
                Option 
                 awards(2)(3) ($) |  |  | 
                Total 
                 ($) |  | ||||||||||||
| 
                Jeffrey L. Ives, Ph.D. 
               |  |  |  |  | 72,500 |  |  |  |  |  | 100,000 |  |  |  |  |  | 100,000 |  |  |  |  | $ | 272,500 |  |  | 
| 
                Martin Vogelbaum 
               |  |  |  |  | 120,000 |  |  |  |  |  | 200,000 |  |  |  |  |  | 200,000 |  |  |  |  | $ | 520,000 |  |  | 
| 
                Lisa von Moltke 
               |  |  |  |  | 55,000 |  |  |  |  |  | 100,000 |  |  |  |  |  | 100,000 |  |  |  |  | $ | 255,000 |  |  | 
| 
                Susan Shiff, Ph.D. 
               |  |  |  |  | 62,500 |  |  |  |  |  | 100,000 |  |  |  |  |  | 100,000 |  |  |  |  | $ | 262,500 |  |  | 
| 
                Helen M. Boudreau 
               |  |  |  |  | 70,000 |  |  |  |  |  | 100,000 |  |  |  |  |  | 100,000 |  |  |  |  | $ | 270,000 |  |  | 
| 
                Director 
               |  |  | 
                RSUs 
               |  |  | 
                Number of 
                 Shares Underlying Options |  | ||||||
| 
                Jeffrey L. Ives, Ph.D. 
               |  |  |  |  | 12,553 |  |  |  |  |  | 26,712 |  |  | 
| 
                Martin Vogelbaum 
               |  |  |  |  | 25,107 |  |  |  |  |  | 52,300 |  |  | 
| 
                Lisa von Moltke 
               |  |  |  |  | 12,553 |  |  |  |  |  | 23,816 |  |  | 
| 
                Susan Shiff, Ph.D. 
               |  |  |  |  | 12,553 |  |  |  |  |  | 25,478 |  |  | 
| 
                Helen M. Boudreau 
               |  |  |  |  | 12,553 |  |  |  |  |  | 29,228 |  |  | 
|  |  |  | 
                Member
                 Annual Service Retainer |  |  | 
                Chairperson / Lead Independent
                 Director and Committee Chair Annual Service Retainer |  | ||||||
| 
                Board of Directors 
               |  |  |  | $ | 50,000 |  |  |  |  | $ | 85,000 |  |  | 
| 
                Audit Committee 
               |  |  |  |  | 10,000 |  |  |  |  |  | 20,000 |  |  | 
| 
                Compensation Committee 
               |  |  |  |  | 7,500 |  |  |  |  |  | 15,000 |  |  | 
| 
                Nominating and Corporate Governance Committee 
               |  |  |  |  | 5,000 |  |  |  |  |  | 10,000 |  |  | 
| 
                Plan 
               |  |  | 
                Number of securities 
                 to be issued upon exercise of outstanding options, warrants and rights (a) |  |  | 
                Weighted-average 
                 exercise price of outstanding options, warrants and rights (b)(2) |  |  | 
                Number of securities 
                 remaining available for future issuance under equity compensation plans (excluding shares of common stock reflected in column (a)) (c)(3) |  | |||||||||
| 
                Equity compensation plans approved by security 
                 holders(1) |  |  |  |  | 420,373 |  |  |  |  | $ | 86.35 |  |  |  |  |  | 494,275 |  |  | 
| 
                Equity compensation plans not approved by security holders 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 25,000(4) |  |  | 
| 
                Total 
               |  |  |  |  | 420,373 |  |  |  |  | $ | 86.35 |  |  |  |  |  | 519,275 |  |  | 
| 
                Name and Principal Position 
               |  |  | 
                Year 
               |  |  | 
                Salary 
                 ($) |  |  | 
                Bonus
                 ($) |  |  | 
                Option 
                 awards ($)(1) |  |  | 
                All other 
                 compensation ($)(3) |  |  | 
                Total 
                 ($) |  | ||||||||||||||||||
| 
                Imran Alibhai, Ph.D.
               
                Chief Executive Officer and Director
               |  |  |  |  | 2024 |  |  |  |  | $ | 551,050 |  |  |  |  | $ | 275,525 |  |  |  |  |  | — |  |  |  |  | $ | 30,755 |  |  |  |  | $ | 857,330 |  |  | 
|  |  |  | 2023 |  |  |  |  | $ | 535,000 |  |  |  |  | $ | 267,500 |  |  |  |  |  | — |  |  |  |  | $ | 28,757 |  |  |  |  | $ | 831,257 |  |  | ||
| 
                John Kauh, M.D.
               
                Chief Medical Officer
               |  |  |  |  | 2024 |  |  |  |  | $ | 412,000 |  |  |  |  | $ | 123,600 |  |  |  |  |  | — |  |  |  |  | $ | 30,230 |  |  |  |  | $ | 565,830 |  |  | 
|  |  |  | 2023 |  |  |  |  | $ | 369,445(4) |  |  |  |  | $ | 135,466(2) |  |  |  |  | $ | 288,455 |  |  |  |  | $ | 25,989 |  |  |  |  | $ | 819,355 |  |  | ||
| 
                Dan Conn, J.D., M.B.A.
               
                Chief Financial Officer
               |  |  |  |  | 2024 |  |  |  |  | $ | 381,100 |  |  |  |  | $ | 171,495 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  | $ | 552,595 |  |  | 
|  |  |  | 2023 |  |  |  |  | $ | 370,000 |  |  |  |  | $ | 111,000 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  | $ | 481,000 |  |  | ||
| 
                Name 
               |  |  | 
                Base
                 Salary ($) |  | |||
| 
                Imran Alibhai, Ph.D. 
               |  |  |  |  | 551,050 |  |  | 
| 
                John Kauh, M.D. 
               |  |  |  |  | 412,000 |  |  | 
| 
                Dan Conn, J.D., M.B.A. 
               |  |  |  |  | 381,100 |  |  | 
| 
                Name 
               |  |  | 
                Grant Date 
               |  |  | 
                Vesting
                 Commencement Date |  |  | 
                Option Awards(1)(2)
               |  | |||||||||||||||||||||||||||
|  | 
                Number of
                 Securities Underlying Unexercised Options Exercisable (#) |  |  | 
                Number of
                 Securities Underlying Unexercised Options Unexercisable (#) |  |  | 
                Option
                 Exercise Price Per Share ($) |  |  | 
                Option
                 Expiration Date |  | ||||||||||||||||||||||||||
| 
                Imran Alibhai, Ph.D. 
               |  |  |  |  | 01/16/2019 |  |  |  |  |  | 12/01/2018 |  |  |  |  |  | 1,550,000 |  |  |  |  |  | — |  |  |  |  |  | 0.09 |  |  |  |  |  | 01/15/2029 |  |  | 
|  |  |  |  |  | 01/30/2021 |  |  |  |  |  | 01/01/2020 |  |  |  |  |  | 15,000 |  |  |  |  |  | — |  |  |  |  |  | 0.09 |  |  |  |  |  | 01/29/2031 |  |  | 
|  |  |  |  |  | 12/16/2021 |  |  |  |  |  | 06/04/2021 |  |  |  |  |  | 1,050,000 |  |  |  |  |  | 150,000 |  |  |  |  |  | 0.63 |  |  |  |  |  | 12/15/2031 |  |  | 
| 
                John Kauh, M.D. 
               |  |  |  |  | 01/12/2023 |  |  |  |  |  | 01/30/2023 |  |  |  |  |  | 264,561 |  |  |  |  |  | 287,568 |  |  |  |  |  | 0.82 |  |  |  |  |  | 01/11/2033 |  |  | 
| 
                Dan Conn, J.D., M.B.A 
               |  |  |  |  | 02/04/2022 |  |  |  |  |  | 01/12/2022 |  |  |  |  |  | 484,166 |  |  |  |  |  | 179,834 |  |  |  |  |  | 0.63 |  |  |  |  |  | 02/03/2032 |  |  | 
| 
                Name 
               |  |  | 
                Fees Earned
                 or Paid in Cash ($) |  |  | 
                Option
                 Awards ($)(2) |  |  | 
                All Other
                 Compensation ($)(3) |  |  | 
                Total
                 ($) |  | ||||||||||||
| 
                Sujal Shah(1) 
               |  |  |  |  | 25,000 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 25,000 |  |  | 
| 
                Wallace Hall 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Jamie McNab 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Michael Wyzga 
               |  |  |  |  | 25,000 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 25,000 |  |  | 
| 
                Shaheen Wirk 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 10,000 |  |  |  |  |  | 10,000 |  |  | 
| 
                Name 
               |  |  | 
                Shares
                 Underlying Outstanding Options as of December 31, 2023 |  | |||
| 
                Sujal Shah 
               |  |  |  |  | 137,500 |  |  | 
| 
                Wallace Hall 
               |  |  |  |  | — |  |  | 
| 
                Jamie McNab 
               |  |  |  |  | — |  |  | 
| 
                Michael Wyzga 
               |  |  |  |  | 137,500 |  |  | 
| 
                Shaheen Wirk 
               |  |  |  |  | 15,000 |  |  | 
| 
                Participants(1)
               |  |  | 
                Aggregate
                 Principal Amount of the Convertible Notes ($) |  | |||
| 
                Entities affiliates with Slate Path(2)
               |  |  |  |  | 2,000,000 |  |  | 
| 
                BioMatrix Partners Ltd.(6)
               |  |  |  |  | 1,000,000 |  |  | 
| 
                Participants(1)
               |  |  | 
                Shares of
                 Series B Preferred Stock Purchased (#) |  |  | 
                Aggregate
                 Purchase Price ($) |  | ||||||
| 
                Entities affiliates with Slate Path(2)
               |  |  |  |  | 5,250,032 |  |  |  |  |  | 19,999,996.91 |  |  | 
| 
                Entities affiliated with Sporos(3)
               |  |  |  |  | 4,684,679 |  |  |  |  |  | 17,077,031.89 |  |  | 
| 
                David J. Tweardy 
               |  |  |  |  | 53,695 |  |  |  |  |  | 163,643.82 |  |  | 
| 
                Entities affiliated with Palkon(4)
               |  |  |  |  | 3,274,707 |  |  |  |  |  | 12,474,996.33 |  |  | 
| 
                Shaheen Wirk(5)
               |  |  |  |  | 31,252 |  |  |  |  |  | 105,830.12 |  |  | 
| 
                BioMatrix Partners Ltd.(6) 
               |  |  |  |  | 173,448 |  |  |  |  |  | 528,602.73 |  |  | 
| 
                Name of beneficial owner 
               |  |  | 
                Number of Shares
                 Beneficially Owned |  |  | 
                Percentage of Shares
                 Beneficially Owned |  | ||||||
| 5% or Greater Stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Vifor (International) Ltd(1)
               |  |  |  |  | 616,397 |  |  |  |  |  | 13.5% |  |  | 
| Executive Officers and Directors |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Christopher Posner(2)
               |  |  |  |  | 73,613 |  |  |  |  |  | 1.6% |  |  | 
| 
                Ryan Maynard(3)
               |  |  |  |  | 15,759 |  |  |  |  |  | * |  |  | 
| 
                Scott Terrillion(4)
               |  |  |  |  | 39,878 |  |  |  |  |  | * |  |  | 
| 
                Martin Vogelbaum(5)
               |  |  |  |  | 28,943 |  |  |  |  |  | * |  |  | 
| 
                Helen M. Boudreau(6)
               |  |  |  |  | 6,489 |  |  |  |  |  | * |  |  | 
| 
                Jeffrey L. Ives, Ph.D.(7)
               |  |  |  |  | 14,449 |  |  |  |  |  | * |  |  | 
| 
                Susan Shiff, Ph.D.(8)
               |  |  |  |  | 13,515 |  |  |  |  |  | * |  |  | 
| 
                Lisa von Moltke, M.D.(9)
               |  |  |  |  | 9,308 |  |  |  |  |  | * |  |  | 
| 
                Joana Goncalves, M.D.(10)
               |  |  |  |  | 4,447 |  |  |  |  |  | * |  |  | 
| 
                All current executive officers and directors as a group (8 persons)(11)
               |  |  |  |  | 201,954 |  |  |  |  |  | 4.3% |  |  | 
| 
                Name of Beneficial Owner 
               |  |  | 
                Number of Shares
                 Beneficially Owned (#) |  |  | 
                Percentage of Shares
                 Beneficially Owned Before this Offering (%) |  | ||||||
| Greater than 5% Holders: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Entities affiliated with David J. Tweardy(1)
               |  |  |  |  | 11,925,202 |  |  |  |  |  | 24.44% |  |  | 
| 
                Ronald DePinho(2)
               |  |  |  |  | 5,750,000 |  |  |  |  |  | 11.79% |  |  | 
| 
                Entities affiliated with Slate Path(3)
               |  |  |  |  | 5,250,032 |  |  |  |  |  | 10.77% |  |  | 
| 
                Entities affiliated with Sporos(4)
               |  |  |  |  | 8,440,962 |  |  |  |  |  | 17.31% |  |  | 
| 
                Entities affiliated with Palkon(5)
               |  |  |  |  | 3,274,707 |  |  |  |  |  | 6.72% |  |  | 
| Directors and Named Executive Officers: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Imran Alibhai(6)
               |  |  |  |  | 2,690,000 |  |  |  |  |  | 5.23% |  |  | 
| 
                Dan Conn(7)
               |  |  |  |  | 525,666 |  |  |  |  |  | 1.07% |  |  | 
| 
                John Kauh(8)
               |  |  |  |  | 287,567 |  |  |  |  |  | * |  |  | 
| 
                Sujal Shah(9)
               |  |  |  |  | 133,750 |  |  |  |  |  | * |  |  | 
| 
                Wallace Hall(10)
               |  |  |  |  | 1,423,448 |  |  |  |  |  | 2.92% |  |  | 
| 
                Jamie McNab(11)
               |  |  |  |  | 5,250,032 |  |  |  |  |  | 10.77% |  |  | 
| 
                Shaheen Wirk, M.D.(12)
               |  |  |  |  | 3,320,959 |  |  |  |  |  | 6.81% |  |  | 
| 
                Michael Wyzga(13)
               |  |  |  |  | 100,260 |  |  |  |  |  | * |  |  | 
| 
                All directors and executive officers as a group (10 persons)(14)
               |  |  |  |  | 13,997,307 |  |  |  |  |  | 26.52% |  |  | 
| 
                Name of Beneficial Owner 
               |  |  | 
                Number of Shares
                 Beneficially Owned |  |  | 
                Percentage of Shares
                 Beneficially Owned |  | ||||||
| 5% or Greater Stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Entities affiliated with David J. Tweardy(1)
               |  |  |  |  | 2,435,233 |  |  |  |  |  | 17.14% |  |  | 
| 
                Ronald DePinho(2)
               |  |  |  |  | 1,174,202 |  |  |  |  |  | 8.26% |  |  | 
| 
                Entities affiliated with Slate Path(3)
               |  |  |  |  | 1,207,876 |  |  |  |  |  | 8.50% |  |  | 
| 
                Entities affiliated with Sporos(4)
               |  |  |  |  | 1,723,721 |  |  |  |  |  | 12.14% |  |  | 
| Named Executive Officers and Directors |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Imran Alibhai(5)
               |  |  |  |  | 549,322 |  |  |  |  |  | 3.72% |  |  | 
| 
                Dan Conn(6)
               |  |  |  |  | 107,345 |  |  |  |  |  | * |  |  | 
| 
                John Kauh(7)
               |  |  |  |  | 58,723 |  |  |  |  |  | * |  |  | 
| 
                Sujal Shah(8)
               |  |  |  |  | 27,312 |  |  |  |  |  | * |  |  | 
| 
                Wallace Hall(9)
               |  |  |  |  | 375,436 |  |  |  |  |  | 2.64% |  |  | 
| 
                Shaheen Wirk, M.D.(10)
               |  |  |  |  | 678,170 |  |  |  |  |  | 4.77% |  |  | 
| 
                Michael Wyzga(11)
               |  |  |  |  | 20,474 |  |  |  |  |  | * |  |  | 
| 
                All executive officers and directors as a group (9 persons)(12)
               |  |  |  |  | 1,871,026 |  |  |  |  |  | 12.45% |  |  | 
|  | Cara Therapeutics, Inc. 400 Atlantic Street Suite 500 Stamford, CT 06901 (203) 406-3700 Attn: Investor Relations |  |  | Tvardi Therapeutics, Inc. 3 Sugar Creek Center Blvd. Suite 525 Sugar Land, TX 77478 (713) 489-8654 Attn: Investor Relations |  | 
|  |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||
|  |  |  | 
                6(A)
                 Cara Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Asset Disposition and Other Adjustments |  |  |  |  |  | 
                Cara 
                 Therapeutics, Inc. |  |  | 
                6(B)
                 Tvardi Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Convertible Note Financing |  |  |  |  |  | 
                Tvardi 
                 Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Reverse Merger |  |  |  |  |  | 
                Pro Forma 
                 Combined |  | ||||||||||||||||||||||||
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash and cash equivalents 
               |  |  |  | $ | 37,061 |  |  |  |  | $ | — |  |  |  |  |  |  |  | $ | 30,933 |  |  |  |  | $ | 9,438 |  |  |  |  | $ | 28,298 |  |  |  | 
                6(g) 
               |  |  |  | $ | 37,736 |  |  |  |  | $ | (2,763) |  |  |  | 
                6(i) 
               |  |  |  | $ | 64,770 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | (2,375) |  |  |  | 
                6(c) 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,136) |  |  |  | 
                6(i) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |  | 
                6(b) 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 1,369 |  |  |  | 
                6(d) 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | (6,622) |  |  |  | 
                6(f) 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Marketable securities 
               |  |  |  |  | 4,975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,975 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,975 |  |  | 
| 
                Accounts receivable, net − related party 
               |  |  |  |  | 435 |  |  |  |  |  | (435) |  |  |  | 
                6(d) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Inventory, net 
               |  |  |  |  | 625 |  |  |  |  |  | (625) |  |  |  | 
                6(c) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Other receivables 
               |  |  |  |  | 934 |  |  |  |  |  | (934) |  |  |  | 
                6(d) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Prepaid expenses and other current assets 
               |  |  |  |  | 2,382 |  |  |  |  |  | (2,382) |  |  |  | 
                6(e) 
               |  |  |  |  | — |  |  |  |  |  | 1,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,265 |  |  | 
| 
                Restricted cash 
               |  |  |  |  | 1,500 |  |  |  |  |  | (1,500) |  |  |  | 
                6(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Total current assets 
               |  |  |  |  | 47,912 |  |  |  |  |  | (12,004) |  |  |  |  |  |  |  |  | 35,908 |  |  |  |  |  | 10,703 |  |  |  |  |  | 28,298 |  |  |  |  |  |  |  |  | 39,001 |  |  |  |  |  | (3,899) |  |  |  |  |  |  |  |  | 71,010 |  |  | 
| 
                Property, equipment and improvements, net 
               |  |  |  |  | 3,417 |  |  |  |  |  | (3,417) |  |  |  | 
                6(a) 
               |  |  |  |  | — |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  | 
| 
                Intangible assets, net 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 401 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 401 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 401 |  |  | 
| 
                Operating lease right-of-use assets 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 218 |  |  | 
| 
                Deferred offering costs 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 1,083 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,083 |  |  |  |  |  | (1,083) |  |  |  | 
                6(j) 
               |  |  |  |  | — |  |  | 
| 
                Other non-current assets 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  | 
| 
                Total assets 
               |  |  |  | $ | 51,329 |  |  |  |  | $ | (15,421) |  |  |  |  |  |  |  | $ | 35,908 |  |  |  |  | $ | 12,514 |  |  |  |  | $ | 28,298 |  |  |  |  |  |  |  | $ | 40,812 |  |  |  |  | $ | (4,982) |  |  |  |  |  |  |  | $ | 71,738 |  |  | 
| 
                Liabilities, Convertible Preferred 
                 Stock and Stockholders’ Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Current liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts payable and accrued 
                 expenses |  |  |  | $ | 6,622 |  |  |  |  | $ | (6,622) |  |  |  | 
                6(f) 
               |  |  |  | $ | — |  |  |  |  | $ | 5,215 |  |  |  |  | $ | 100 |  |  |  | 
                6(g) 
               |  |  |  | $ | 5,315 |  |  |  |  | $ | 7,900 |  |  |  | 
                6(h) 
               |  |  |  | $ | 17,229 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,014 |  |  |  | 
                6(j) 
               |  |  |  |  |  |  |  | 
| 
                Operating lease liability – current portion 
               |  |  |  |  | 3,417 |  |  |  |  |  | (3,417) |  |  |  | 
                6(a) 
               |  |  |  | $ | — |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  | 
| 
                Convertible Notes 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 28,298 |  |  |  | 
                6(g) 
               |  |  |  |  | 28,298 |  |  |  |  |  | 7,254 |  |  |  | 
                6(n) 
               |  |  |  |  | — |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,552) |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
| 
                Total current liabilities 
               |  |  |  |  | 10,039 |  |  |  |  |  | (10,039) |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 5,307 |  |  |  |  |  | 28,398 |  |  |  |  |  |  |  |  | 33,705 |  |  |  |  |  | (16,384) |  |  |  |  |  |  |  |  | 17,321 |  |  | 
|  |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||
|  |  |  | 
                6(A)
                 Cara Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Asset Disposition and Other Adjustments |  |  |  |  |  | 
                Cara 
                 Therapeutics, Inc. |  |  | 
                6(B)
                 Tvardi Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Convertible Note Financing |  |  |  |  |  | 
                Tvardi 
                 Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Reverse Merger |  |  |  |  |  | 
                Pro Forma 
                 Combined |  | ||||||||||||||||||||||||
| 
                Liability related to sales of future royalties and milestones, net 
               |  |  |  |  | 40,583 |  |  |  |  |  | (40,583) |  |  |  | 
                6(c) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Operating lease liability – net of current portion 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 207 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 207 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 207 |  |  | 
| 
                Total liabilities 
               |  |  |  |  | 50,622 |  |  |  |  |  | (50,622) |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 5,514 |  |  |  |  |  | 28,398 |  |  |  |  |  |  |  |  | 33,912 |  |  |  |  |  | (16,384) |  |  |  |  |  |  |  |  | 17,528 |  |  | 
| 
                Tvardi redeemable convertible preferred stock (Series A, B), $0.001 par value 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 85,503 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,503 |  |  |  |  |  | (85,503) |  |  |  | 
                6(k) 
               |  |  |  |  | — |  |  | 
| Stockholders’ equity (deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cara preferred stock; $0.001 par value 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  | — |  |  | 
| 
                Cara common stock; $0.001 par value 
               |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 
                6(m) 
               |  |  |  |  | 12 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  | 
                6(l) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 
                6(o) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
| 
                Tvardi common stock, $0.001 par value 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  | 30 |  |  |  | 
                6(k) 
               |  |  |  |  | — |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49) |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
| 
                Additional paid-in capital 
               |  |  |  |  | 748,660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 748,660 |  |  |  |  |  | 1,007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,007 |  |  |  |  |  | 85,473 |  |  |  | 
                6(k) 
               |  |  |  |  | 141,106 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 
                6(l)
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,550 |  |  |  | 
                6(o) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,097) |  |  |  | 
                6(j) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |  |  |  | 
                6(m) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (724,624) |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
| 
                Accumulated other comprehensive loss 
               |  |  |  |  | (25) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25) |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25) |  |  | 
| 
                Accumulated deficit 
               |  |  |  |  | (747,933) |  |  |  |  |  | 37,583 |  |  |  | 
                6(c) 
               |  |  |  |  | (712,732) |  |  |  |  |  | (79,529) |  |  |  |  |  | (100) |  |  |  | 
                6(g) 
               |  |  |  |  | (79,629) |  |  |  |  |  | (135) |  |  |  | 
                6(m) 
               |  |  |  |  | (86,883) |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | (2,382) |  |  |  | 
                6(e) 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,900) |  |  |  | 
                6(h) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,763) |  |  |  | 
                6(i) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,136) |  |  |  | 
                6(i) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 724,666 |  |  |  | 
                6(n) 
               |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,254) |  |  |  | 
                6(o) 
               |  |  |  |  |  |  |  | 
| 
                Total stockholders’ equity (deficit) 
               |  |  |  |  | 707 |  |  |  |  |  | 35,201 |  |  |  |  |  |  |  |  | 35,908 |  |  |  |  |  | (78,503) |  |  |  |  |  | (100) |  |  |  |  |  |  |  |  | (78,603) |  |  |  |  |  | 96,905 |  |  |  |  |  |  |  |  | 54,210 |  |  | 
| 
                Total liabilities and stockholders’ 
                 equity (deficit) |  |  |  | $ | 51,329 |  |  |  |  | $ | (15,421) |  |  |  |  |  |  |  | $ | 35,908 |  |  |  |  | $ | 12,514 |  |  |  |  | $ | 28,298 |  |  |  |  |  |  |  | $ | 40,812 |  |  |  |  | $ | (4,982) |  |  |  |  |  |  |  | $ | 71,738 |  |  | 
|  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|  |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||
|  |  |  | 
                7(A)
                 Cara Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments - Asset Disposition and Other Adjustments |  |  |  |  |  | 
                Cara 
                 Therapeutics, Inc. |  |  | 
                7(B)
                 Tvardi Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments - Reverse Merger |  |  | 
                Pro Forma 
                 Combined |  |  |  |  |  |  |  | ||||||||||||||||||
| Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Collaborative revenue 
               |  |  |  | $ | 2,086 |  |  |  |  | $ | (2,086) |  |  |  | 
                7(b) 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  |  |  |  |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | 640 |  |  |  |  |  | (640) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | 84 |  |  |  |  |  | (84) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| 
                Other revenue 
               |  |  |  |  | 2,872 |  |  |  |  |  | (2,872) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| 
                Total revenue 
               |  |  |  |  | 5,682 |  |  |  |  |  | (5,682) |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cost of goods sold 
               |  |  |  |  | 620 |  |  |  |  |  | (620) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  |  | 32,634 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,634 |  |  |  |  |  | 15,047 |  |  |  |  |  |  |  |  |  |  |  | 47,681 |  |  |  |  |  |  |  |  | 
| 
                General and administrative 
               |  |  |  |  | 19,699 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,699 |  |  |  |  |  | 2,258 |  |  |  |  |  |  |  |  |  |  |  | 21,957 |  |  |  |  |  |  |  |  | 
| 
                Restructuring 
               |  |  |  |  | 5,689 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,689 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | 5,689 |  |  |  |  |  |  |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 58,642 |  |  |  |  |  | (620) |  |  |  |  |  |  |  |  | 58,022 |  |  |  |  |  | 17,305 |  |  |  |  |  | — |  |  |  |  |  | 75,327 |  |  |  |  |  |  |  |  | 
| 
                Operating loss 
               |  |  |  |  | (52,960) |  |  |  |  |  | (5,062) |  |  |  |  |  |  |  |  | (58,022) |  |  |  |  |  | (17,305) |  |  |  |  |  | — |  |  |  |  |  | (75,327) |  |  |  |  |  |  |  |  | 
| 
                Other income, net 
               |  |  |  |  | 2,407 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,407 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | 2,407 |  |  |  |  |  |  |  |  | 
| 
                Interest income 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 615 |  |  |  |  |  |  |  |  |  |  |  | 615 |  |  |  |  |  |  |  |  | 
| 
                Impairment of long-lived assets 
               |  |  |  |  | (4,274) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,274) |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | (4,274) |  |  |  |  |  |  |  |  | 
| 
                Inventory write-down 
               |  |  |  |  | (2,509) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,509) |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | (2,509) |  |  |  |  |  |  |  |  | 
| 
                Non-cash interest expense on liability related to sales of future royalties and milestones 
               |  |  |  |  | (5,852) |  |  |  |  |  | 5,852 |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (63,188) |  |  |  |  | $ | 790 |  |  |  |  |  |  |  | $ | (62,398) |  |  |  |  | $ | (16,690) |  |  |  |  | $ | — |  |  |  |  | $ | (79,088) |  |  |  |  |  |  |  |  | 
| Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  | $ | (13.86) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (0.87) |  |  |  |  |  |  |  |  |  |  | $ | (5.57) |  |  |  |  |  |  |  |  | 
| Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  |  | 4,559,944 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,192,595 |  |  |  |  |  |  |  |  |  |  |  | 14,197,663 |  |  |  |  |  | 7(h) |  |  | 
|  |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  | 
                Historical 
               |  |  |  |  |  |  |  |  |  |  |  | 
                As Adjusted 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||
|  |  |  | 
                7(C)
                 Cara Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Asset Disposition and Other Adjustments |  |  |  |  |  | 
                Cara 
                 Therapeutics, Inc. |  |  | 
                7(D)
                 Tvardi Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Convertible Note Financing |  |  |  |  |  | 
                Tvardi 
                 Therapeutics, Inc. |  |  | 
                Transaction 
                 Accounting Adjustments − Reverse Merger |  |  |  |  |  | 
                Pro 
                 Forma Combined |  |  |  |  | ||||||||||||||||||||||||
| Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Collaborative revenue 
               |  |  |  | $ | 12,936 |  |  |  |  | $ | (12,936) |  |  |  | 
                7(b) 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  |  |  |  | $ | — |  |  |  |  |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | 5,843 |  |  |  |  |  | (5,843) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                License and milestone fees 
               |  |  |  |  | 910 |  |  |  |  |  | (910) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Royalty revenue 
               |  |  |  |  | 415 |  |  |  |  |  | (415) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | 165 |  |  |  |  |  | (165) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Other revenue 
               |  |  |  |  | 699 |  |  |  |  |  | (699) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Total revenue 
               |  |  |  |  | 20,968 |  |  |  |  |  | (20,968) |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cost of goods 
                 sold |  |  |  |  | 6,174 |  |  |  |  |  | (6,174) |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  |  | 108,510 |  |  |  |  |  | 1,650 |  |  |  | 
                7(a) 
               |  |  |  |  | 110,160 |  |  |  |  |  | 15,866 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,866 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,026 |  |  |  |  |  | 
| 
                General and administrative 
               |  |  |  |  | 27,779 |  |  |  |  |  | 732 |  |  |  | 
                7(a) 
               |  |  |  |  | 28,511 |  |  |  |  |  | 2,799 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,799 |  |  |  |  |  | 2,763 |  |  |  | 
                7(d) 
               |  |  |  |  | 43,227 |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,136 |  |  |  | 
                7(d) 
               |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900 |  |  |  | 
                7(e) 
               |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |  |  |  | 
                7(f) 
               |  |  |  |  |  |  |  |  |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 142,463 |  |  |  |  |  | (3,792) |  |  |  |  |  |  |  |  | 138,671 |  |  |  |  |  | 18,665 |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 18,665 |  |  |  |  |  | 11,934 |  |  |  |  |  |  |  |  | 169,270 |  |  |  |  |  | 
| 
                Operating loss 
               |  |  |  |  | (121,495) |  |  |  |  |  | (17,176) |  |  |  |  |  |  |  |  | (138,671) |  |  |  |  |  | (18,665) |  |  |  |  |  | — |  |  |  |  |  |  |  |  | (18,665) |  |  |  |  |  | (11,934) |  |  |  |  |  |  |  |  | (169,270) |  |  |  |  |  | 
| 
                Gain in connection with 
                 extinguishment of liability related to sales of future royalties and milestones |  |  |  |  | — |  |  |  |  |  | 37,583 |  |  |  | 
                7(b) 
               |  |  |  |  | 37,583 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,583 |  |  |  |  |  | 
| 
                Other income, net 
               |  |  |  |  | 3,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,586 |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,586 |  |  |  |  |  | 
| 
                Other expense 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | (100) |  |  |  | 
                7(c) 
               |  |  |  |  | (100) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (100) |  |  |  |  |  | 
| 
                Interest income 
               |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 1,318 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,318 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,318 |  |  |  |  |  | 
| 
                Change in fair value of 
                 the Convertible Notes |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,254) |  |  |  | 
                7(g)
               |  |  |  |  | (7,254) |  |  |  |  |  | 
| 
                Non-cash interest expense on liability related to sales of future royalties and milestones 
               |  |  |  |  | (604) |  |  |  |  |  | 604 |  |  |  | 
                7(b) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (118,513) |  |  |  |  | $ | 21,011 |  |  |  |  |  |  |  | $ | (97,502) |  |  |  |  | $ | (17,347) |  |  |  |  | $ | (100) |  |  |  |  |  |  |  | $ | (17,447) |  |  |  |  | $ | (19,188) |  |  |  |  |  |  |  | $ | (134,137) |  |  |  |  |  | 
| Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  | $ | (26.26) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (0.91) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (9.47) |  |  |  |  |  | 
| 
                Weighted average shares: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  |  | 4,512,422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,134,096 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,161,956 |  |  |  | 
                7(h)
               |  | 
|  |  |  | 
                Assuming Cara Net Cash at 
                 Closing of $23.0 Million |  | |||||||||
| 
                Equity Capitalization Summary Upon Consummation of the Merger 
               |  |  | 
                Number of 
                 Shares Owned |  |  | 
                % 
                 Ownership |  | ||||||
| 
                Tvardi stockholders 
               |  |  |  |  | 9,957,011 |  |  |  |  |  | 70.10% |  |  | 
| 
                Cara stockholders 
               |  |  |  |  | 2,325,606 |  |  |  |  |  | 16.37% |  |  | 
| 
                Investors participating in the Convertible Notes 
               |  |  |  |  | 1,921,436 |  |  |  |  |  | 13.53% |  |  | 
| 
                Total common stock of the combined company 
               |  |  |  |  | 14,204,053 |  |  |  |  |  | 100.00% |  |  | 
|  |  |  | 
                Assuming Cara Net Cash at 
                 Closing of $23.0 Million |  | |||||||||
| 
                Equity Capitalization Summary (fully diluted basis) 
               |  |  | 
                Number of 
                 Shares Owned |  |  | 
                % 
                 Ownership |  | ||||||
| 
                Tvardi stockholders(1) 
               |  |  |  |  | 11,065,911 |  |  |  |  |  | 72.21% |  |  | 
| 
                Cara stockholders(2) 
               |  |  |  |  | 2,336,468 |  |  |  |  |  | 15.25% |  |  | 
| 
                Investors participating in the Convertible Notes 
               |  |  |  |  | 1,921,436 |  |  |  |  |  | 12.54% |  |  | 
| 
                Total common stock of the combined company 
               |  |  |  |  | 15,323,815 |  |  |  |  |  | 100.00% |  |  | 
|  | 
                Common shares of the combined company owned by Cara stockholders(1) 
               |  |  |  |  | 2,325,606 |  |  | 
|  | 
                Multiplied by the fair value per share of Cara common stock(2) 
               |  |  |  | $ | 9.68 |  |  | 
|  | 
                Total 
               |  |  |  | $ | 22,512 |  |  | 
|  | 
                Estimated fair value of assumed Cara stock-based awards based on pre-Merger service(3) 
               |  |  |  |  | 255 |  |  | 
|  | 
                Total estimated purchase price 
               |  |  |  | $ | 22,767 |  |  | 
|  | 
                Shares of Tvardi common stock outstanding as of September 30, 2024 
               |  |  |  |  | 19,197,914 |  |  | 
|  | 
                Tvardi stock option exercises subsequent to September 30, 2024
               |  |  |  |  | 5,416 |  |  | 
|  | 
                Shares of Tvardi common stock issued upon conversion of Tvardi convertible preferred stock, see Note 6(k) 
               |  |  |  |  | 29,555,538 |  |  | 
|  | 
                Total Tvardi common stock outstanding prior to the closing of the Merger 
               |  |  |  |  | 48,758,868 |  |  | 
|  | 
                Exchange Ratio 
               |  |  |  |  | 0.2042 |  |  | 
|  | 
                Shares of Tvardi common stock outstanding before the conversion of Tvardi’s Convertible Notes 
               |  |  |  |  | 9,957,011 |  |  | 
|  | 
                Shares of Cara common stock issued upon conversion of Tvardi ‘s Convertible Notes, see Note 6(o) 
               |  |  |  |  | 1,921,436 |  |  | 
|  | 
                Shares of Cara common stock issued to Tvardi stockholders upon closing of the Merger 
               |  |  |  |  | 11,878,447 |  |  | 
| 
                Tvardi Convertible Preferred Stock 
               |  |  |  |  |  |  |  | 
| 
                Series A Preferred Stock 
               |  |  |  |  | 9,499,999 |  |  | 
| 
                Series B Preferred Stock 
               |  |  |  |  | 20,055,539 |  |  | 
| 
                Total shares of Tvardi convertible preferred stock converted to shares of
                 Tvardi common stock immediately prior to the merger |  |  |  |  | 29,555,538 |  |  | 
|  | 
                Accumulated deficit of Cara as of September 30, 2024 
               |  |  |  | $ | (747,933) |  |  | 
|  | 
                Gain in connection with extinguishment of liability related to sales of future royalties and milestones, see Note 6(c) 
               |  |  |  |  | 37,583 |  |  | 
|  | 
                Derecognition of prepaid expenses, See Note 6(e) 
               |  |  |  |  | (2,382) |  |  | 
|  | 
                Transaction costs of Cara, see Note 6(h) 
               |  |  |  |  | (7,900) |  |  | 
|  | 
                Compensation expense related to change-in-control, severance, and retention payments, see Note 6(i) 
               |  |  |  |  | (3,899) |  |  | 
|  | 
                Acceleration of Cara’s RSUs upon closing of the Merger, see Note 6(m) 
               |  |  |  |  | (135) |  |  | 
|  | 
                Total adjustment to derecognize the accumulated deficit of Cara 
               |  |  |  | $ | (724,666) |  |  | 
|  |  |  | 
                September 30, 2024 
               |  |  | 
                December 31, 2023 
               |  | ||||||
|  |  |  | 
                Basic and Diluted 
               |  |  | 
                Basic and Diluted 
               |  | ||||||
| 
                Historical weighted-average number of Tvardi common stock outstanding 
               |  |  |  |  | 19,192,595 |  |  |  |  |  | 19,134,096 |  |  | 
| 
                Tvardi stock option exercises subsequent to September 30, 2024
               |  |  |  |  | 5,416 |  |  |  |  |  | 5,416 |  |  | 
| 
                Impact of Tvardi convertible preferred stock assuming conversion as of January 1, 2023, see Note 6(k) 
               |  |  |  |  | 29,555,538 |  |  |  |  |  | 29,555,538 |  |  | 
| 
                Application of Exchange Ratio to historical Tvardi weighted-average shares outstanding 
               |  |  |  |  | 0.2042 |  |  |  |  |  | 0.2042 |  |  | 
| 
                Adjusted Tvardi weighted-average number of common stock outstanding 
               |  |  |  |  | 9,955,925 |  |  |  |  |  | 9,943,979 |  |  | 
| 
                Impact of Convertible Notes assuming consummation of the Merger as of January 1, 2023, see Note 6(o) 
               |  |  |  |  | 1,921,436 |  |  |  |  |  | 1,921,436 |  |  | 
|  |  |  | 
                September 30, 2024 
               |  |  | 
                December 31, 2023 
               |  | ||||||
|  |  |  | 
                Basic and Diluted 
               |  |  | 
                Basic and Diluted 
               |  | ||||||
| 
                Historical weighted-average number of Cara common stock outstanding, 
                 after giving effect to the proposed Reverse Stock Split at an assumed ratio of 1-for-2 |  |  |  |  | 2,279,972 |  |  |  |  |  | 2,256,211 |  |  | 
| 
                Equity awards subject to outstanding Cara RSUs that fully vest upon 
                 consummation of the Merger(1) |  |  |  |  | 40,330 |  |  |  |  |  | 40,330 |  |  | 
| 
                Pro forma combined weighted average number of common stock outstanding 
               |  |  |  |  | 14,197,663 |  |  |  |  |  | 14,161,956 |  |  | 
|  | |||||||||||||
|  |  |  | 
                Page
               |  | |||
| Financial Statements (Unaudited): |  |  |  |  |  |  |  | 
|  |  |  |  | F-2 |  |  | |
|  |  |  |  | F-3 |  |  | |
|  |  |  |  | F-4 |  |  | |
|  |  |  |  | F-6 |  |  | |
|  |  |  |  | F-7 |  |  | |
|  |  |  | 
                Page 
               |  | |||
| Financial Statements: |  |  |  |  |  |  |  | 
|  |  |  |  | F-34 |  |  | |
|  |  |  |  | F-37 |  |  | |
|  |  |  |  | F-38 |  |  | |
|  |  |  |  | F-39 |  |  | |
|  |  |  |  | F-40 |  |  | |
|  |  |  |  | F-41 |  |  | |
|  |  |  | 
                Page 
               |  | |||
|  |  |  |  | F-89 |  |  | |
|  |  |  |  | F-91 |  |  | |
|  |  |  |  | F-92 |  |  | |
|  |  |  |  | F-93 |  |  | |
|  |  |  |  | F-94 |  |  | |
|  |  |  |  | F-95 |  |  | |
|  |  |  | 
                Page 
               |  | |||
|  |  |  |  | F-115 |  |  | |
|  |  |  |  | F-116 |  |  | |
|  |  |  |  | F-117 |  |  | |
|  |  |  |  | F-118 |  |  | |
|  |  |  |  | F-119 |  |  | |
|  |  |  | 
                September 30,
                 2024 |  |  | 
                December 31,
                 2023 |  | ||||||
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash and cash equivalents 
               |  |  |  | $ | 37,061 |  |  |  |  | $ | 51,775 |  |  | 
| 
                Marketable securities 
               |  |  |  |  | 4,975 |  |  |  |  |  | 48,983 |  |  | 
| 
                Accounts receivable, net – related party 
               |  |  |  |  | 435 |  |  |  |  |  | 2,765 |  |  | 
| 
                Inventory, net 
               |  |  |  |  | 625 |  |  |  |  |  | 2,821 |  |  | 
| 
                Income tax receivable 
               |  |  |  |  | — |  |  |  |  |  | 697 |  |  | 
| 
                Other receivables 
               |  |  |  |  | 934 |  |  |  |  |  | 555 |  |  | 
| 
                Prepaid expenses 
               |  |  |  |  | 2,382 |  |  |  |  |  | 8,154 |  |  | 
| 
                Restricted cash 
               |  |  |  |  | 1,500 |  |  |  |  |  | 408 |  |  | 
| 
                Total current assets 
               |  |  |  |  | 47,912 |  |  |  |  |  | 116,158 |  |  | 
| 
                Operating lease right-of-use assets 
               |  |  |  |  | — |  |  |  |  |  | 4,864 |  |  | 
| 
                Property and equipment, net 
               |  |  |  |  | 3,417 |  |  |  |  |  | 3,322 |  |  | 
| 
                Restricted cash, non-current 
               |  |  |  |  | — |  |  |  |  |  | 1,500 |  |  | 
| 
                Total assets 
               |  |  |  | $ | 51,329 |  |  |  |  | $ | 125,844 |  |  | 
| Liabilities and stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  | $ | 6,622 |  |  |  |  | $ | 25,592 |  |  | 
| 
                Operating lease liability, current 
               |  |  |  |  | 3,417 |  |  |  |  |  | — |  |  | 
| 
                Total current liabilities 
               |  |  |  |  | 10,039 |  |  |  |  |  | 25,592 |  |  | 
| 
                Liability related to sales of future royalties and milestones, net 
               |  |  |  |  | 40,583 |  |  |  |  |  | 37,079 |  |  | 
| 
                Operating lease liability, non-current 
               |  |  |  |  | — |  |  |  |  |  | 6,088 |  |  | 
| 
                Total liabilities 
               |  |  |  |  | 50,622 |  |  |  |  |  | 68,759 |  |  | 
| 
                Commitments and contingencies (Note 17) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| Stockholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Preferred stock; $0.001 par value; 5,000,000 shares authorized at September 30, 2024 and December 31, 2023, zero shares issued and outstanding at September 30, 2024 and December 31, 2023 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Common stock; $0.001 par value; 16,666,667 shares and 8,333,333 shares authorized at September 30, 2024 and December 31, 2023, respectively, 4,750,553 shares and 4,540,059 shares issued and outstanding at September 30, 2024 and December 31, 2023, 
                 respectively |  |  |  |  | 5 |  |  |  |  |  | 5 |  |  | 
| 
                Additional paid-in capital 
               |  |  |  |  | 748,660 |  |  |  |  |  | 742,085 |  |  | 
| 
                Accumulated deficit 
               |  |  |  |  | (747,933) |  |  |  |  |  | (684,745) |  |  | 
| 
                Accumulated other comprehensive loss 
               |  |  |  |  | (25) |  |  |  |  |  | (260) |  |  | 
| 
                Total stockholders’ equity 
               |  |  |  |  | 707 |  |  |  |  |  | 57,085 |  |  | 
| 
                Total liabilities and stockholders’ equity 
               |  |  |  | $ | 51,329 |  |  |  |  | $ | 125,844 |  |  | 
|  |  |  | 
                Three Months Ended 
               |  |  | 
                Nine Months Ended 
               |  | ||||||||||||||||||
|  |  |  | 
                September 30,
                 2024 |  |  | 
                September 30,
                 2023 |  |  | 
                September 30,
                 2024 |  |  | 
                September 30,
                 2023 |  | ||||||||||||
| Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Collaborative revenue 
               |  |  |  | $ | 1,298 |  |  |  |  | $ | 2,471 |  |  |  |  | $ | 2,086 |  |  |  |  | $ | 10,631 |  |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | — |  |  |  |  |  | 1,252 |  |  |  |  |  | 640 |  |  |  |  |  | 5,843 |  |  | 
| 
                License and milestone fees 
               |  |  |  |  | — |  |  |  |  |  | 910 |  |  |  |  |  | — |  |  |  |  |  | 910 |  |  | 
| 
                Royalty revenue 
               |  |  |  |  | — |  |  |  |  |  | 167 |  |  |  |  |  | — |  |  |  |  |  | 415 |  |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | — |  |  |  |  |  | 66 |  |  |  |  |  | 84 |  |  |  |  |  | 165 |  |  | 
| 
                Other revenue 
               |  |  |  |  | 1,258 |  |  |  |  |  | — |  |  |  |  |  | 2,872 |  |  |  |  |  | — |  |  | 
| 
                Total revenue 
               |  |  |  |  | 2,556 |  |  |  |  |  | 4,866 |  |  |  |  |  | 5,682 |  |  |  |  |  | 17,964 |  |  | 
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cost of goods sold 
               |  |  |  |  | — |  |  |  |  |  | 1,558 |  |  |  |  |  | 620 |  |  |  |  |  | 5,566 |  |  | 
| 
                Research and development 
               |  |  |  |  | 1,362 |  |  |  |  |  | 25,451 |  |  |  |  |  | 32,634 |  |  |  |  |  | 80,095 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 6,475 |  |  |  |  |  | 6,755 |  |  |  |  |  | 19,699 |  |  |  |  |  | 21,191 |  |  | 
| 
                Restructuring 
               |  |  |  |  | 707 |  |  |  |  |  | — |  |  |  |  |  | 5,689 |  |  |  |  |  | — |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 8,544 |  |  |  |  |  | 33,764 |  |  |  |  |  | 58,642 |  |  |  |  |  | 106,852 |  |  | 
| 
                Operating loss 
               |  |  |  |  | (5,988) |  |  |  |  |  | (28,898) |  |  |  |  |  | (52,960) |  |  |  |  |  | (88,888) |  |  | 
| 
                Other income, net 
               |  |  |  |  | 766 |  |  |  |  |  | 866 |  |  |  |  |  | 2,407 |  |  |  |  |  | 2,712 |  |  | 
| 
                Impairment of long-lived assets 
               |  |  |  |  | (4,274) |  |  |  |  |  | — |  |  |  |  |  | (4,274) |  |  |  |  |  | — |  |  | 
| 
                Inventory write-down 
               |  |  |  |  | (1,020) |  |  |  |  |  | — |  |  |  |  |  | (2,509) |  |  |  |  |  | — |  |  | 
| 
                Non-cash interest expense on liability related to sales 
                 of future royalties and milestones |  |  |  |  | (1,960) |  |  |  |  |  | — |  |  |  |  |  | (5,852) |  |  |  |  |  | — |  |  | 
| 
                Net loss 
               |  |  |  | $ | (12,476) |  |  |  |  | $ | (28,032) |  |  |  |  | $ | (63,188) |  |  |  |  | $ | (86,176) |  |  | 
| Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  | $ | (2.73) |  |  |  |  | $ | (6.20) |  |  |  |  | $ | (13.86) |  |  |  |  | $ | (19.14) |  |  | 
| Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  |  | 4,570,320 |  |  |  |  |  | 4,519,641 |  |  |  |  |  | 4,559,944 |  |  |  |  |  | 4,503,187 |  |  | 
| Other comprehensive income, net of tax of $0: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Change in unrealized gains on available-for-sale marketable securities 
               |  |  |  |  | 96 |  |  |  |  |  | 291 |  |  |  |  |  | 235 |  |  |  |  |  | 1,233 |  |  | 
| 
                Total comprehensive loss 
               |  |  |  | $ | (12,380) |  |  |  |  | $ | (27,741) |  |  |  |  | $ | (62,953) |  |  |  |  | $ | (84,943) |  |  | 
|  |  |  | 
                Common Stock 
               |  |  | 
                Additional
                 Paid-In Capital |  |  | 
                Accumulated
                 Deficit |  |  | 
                Accumulated
                 Other Comprehensive Loss |  |  | 
                Total
                 Stockholders’ Equity |  | |||||||||||||||||||||
|  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||
| 
                Balance at December 31, 2023 
               |  |  |  |  | 4,540,059 |  |  |  |  | $ | 5 |  |  |  |  | $ | 742,085 |  |  |  |  | $ | (684,745) |  |  |  |  | $ | (260) |  |  |  |  | $ | 57,085 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,660 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,660 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 15,531 |  |  |  |  |  | — |  |  |  |  |  | 1,685 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,685 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (30,696) |  |  |  |  |  | — |  |  |  |  |  | (30,696) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 69 |  |  |  |  |  | 69 |  |  | 
| 
                Balance at March 31, 2024 
               |  |  |  |  | 4,555,590 |  |  |  |  | $ | 5 |  |  |  |  | $ | 745,430 |  |  |  |  | $ | (715,441) |  |  |  |  | $ | (191) |  |  |  |  | $ | 29,803 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,507 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,507 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 14,224 |  |  |  |  |  | — |  |  |  |  |  | 234 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 234 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (20,016) |  |  |  |  |  | — |  |  |  |  |  | (20,016) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 70 |  |  |  |  |  | 70 |  |  | 
| 
                Balance at June 30, 2024 
               |  |  |  |  | 4,569,814 |  |  |  |  | $ | 5 |  |  |  |  | $ | 747,171 |  |  |  |  | $ | (735,457) |  |  |  |  | $ | (121) |  |  |  |  | $ | 11,598 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,338 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,338 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 739 |  |  |  |  |  | — |  |  |  |  |  | 151 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 151 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (12,476) |  |  |  |  |  | — |  |  |  |  |  | (12,476) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 96 |  |  |  |  |  | 96 |  |  | 
| 
                Balance at September 30, 2024 
               |  |  |  |  | 4,570,553 |  |  |  |  | $ | 5 |  |  |  |  | $ | 748,660 |  |  |  |  | $ | (747,933) |  |  |  |  | $ | (25) |  |  |  |  | $ | 707 |  |  | 
|  |  |  | 
                Common Stock 
               |  |  | 
                Additional
                 Paid-In Capital |  |  | 
                Accumulated
                 Deficit |  |  | 
                Accumulated
                 Other Comprehensive Loss |  |  | 
                Total
                 Stockholders’ Equity |  | |||||||||||||||||||||
|  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||
| 
                Balance at December 31, 2022 
               |  |  |  |  | 4,483,112 |  |  |  |  | $ | 4 |  |  |  |  | $ | 726,679 |  |  |  |  | $ | (566,232) |  |  |  |  | $ | (1,672) |  |  |  |  | $ | 158,779 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2,972 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2,972 |  |  | 
| 
                Shares issued upon exercise of stock options 
               |  |  |  |  | 7,768 |  |  |  |  |  | 1 |  |  |  |  |  | 559 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 560 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 6,983 |  |  |  |  |  | — |  |  |  |  |  | 381 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 381 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (26,665) |  |  |  |  |  | — |  |  |  |  |  | (26,665) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 571 |  |  |  |  |  | 571 |  |  | 
| 
                Balance at March 31, 2023 
               |  |  |  |  | 4,497,863 |  |  |  |  | $ | 5 |  |  |  |  | $ | 730,591 |  |  |  |  | $ | (592,897) |  |  |  |  | $ | (1,101) |  |  |  |  | $ | 136,598 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3,116 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3,116 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 7,871 |  |  |  |  |  | — |  |  |  |  |  | 326 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 326 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (31,479) |  |  |  |  |  | — |  |  |  |  |  | (31,479) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 371 |  |  |  |  |  | 371 |  |  | 
| 
                Balance at June 30, 2023 
               |  |  |  |  | 4,505,734 |  |  |  |  | $ | 5 |  |  |  |  | $ | 734,033 |  |  |  |  | $ | (624,376) |  |  |  |  | $ | (730) |  |  |  |  | $ | 108,932 |  |  | 
| 
                Net proceeds from sales of common stock under open market sales agreement 
               |  |  |  |  | 32,340 |  |  |  |  |  | — |  |  |  |  |  | 1,117 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,117 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3,171 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3,171 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 1,345 |  |  |  |  |  | — |  |  |  |  |  | 163 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 163 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (28,032) |  |  |  |  |  | — |  |  |  |  |  | (28,032) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 291 |  |  |  |  |  | 291 |  |  | 
| 
                Balance at September 30, 2023 
               |  |  |  |  | 4,539,319 |  |  |  |  | $ | 5 |  |  |  |  | $ | 738,484 |  |  |  |  | $ | (652,408) |  |  |  |  | $ | (439) |  |  |  |  | $ | 85,642 |  |  | 
|  |  |  | 
                Nine Months Ended, 
               |  | |||||||||
|  |  |  | 
                September 30,
                 2024 |  |  | 
                September 30,
                 2023 |  | ||||||
| Operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (63,188) |  |  |  |  | $ | (86,176) |  |  | 
| 
                Adjustments to reconcile net loss to net cash used in operating activities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | 6,575 |  |  |  |  |  | 10,129 |  |  | 
| 
                Non-cash interest expense on liability related to sales of future royalties and 
                 milestones, net of issuance costs accretion |  |  |  |  | 5,852 |  |  |  |  |  | — |  |  | 
| 
                Impairment of long-lived assets 
               |  |  |  |  | 4,274 |  |  |  |  |  |  |  |  | 
| 
                Inventory write-down 
               |  |  |  |  | 2,509 |  |  |  |  |  | — |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | 192 |  |  |  |  |  | 177 |  |  | 
| 
                Noncash lease expense 
               |  |  |  |  | 766 |  |  |  |  |  | 1,221 |  |  | 
| 
                Accretion of available-for-sale marketable securities, net 
               |  |  |  |  | (543) |  |  |  |  |  | (159) |  |  | 
| 
                Changes in operating assets and liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts receivable, net – related party 
               |  |  |  |  | 2,330 |  |  |  |  |  | (91) |  |  | 
| 
                Inventory 
               |  |  |  |  | (313) |  |  |  |  |  | (883) |  |  | 
| 
                Income tax receivable 
               |  |  |  |  | 697 |  |  |  |  |  | — |  |  | 
| 
                Other receivables 
               |  |  |  |  | (379) |  |  |  |  |  | (1,186) |  |  | 
| 
                Prepaid expenses 
               |  |  |  |  | 5,772 |  |  |  |  |  | 3,609 |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  |  | (19,149) |  |  |  |  |  | 37 |  |  | 
| 
                Operating lease liability 
               |  |  |  |  | (4,363) |  |  |  |  |  | (1,278) |  |  | 
| 
                Reimbursement of lease incentive 
               |  |  |  |  | 2,094 |  |  |  |  |  | — |  |  | 
| 
                Other 
               |  |  |  |  | — |  |  |  |  |  | (108) |  |  | 
| 
                Net cash used in operating activities 
               |  |  |  |  | (56,874) |  |  |  |  |  | (74,708) |  |  | 
| Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Proceeds from maturities of available-for-sale marketable securities 
               |  |  |  |  | 77,000 |  |  |  |  |  | 118,590 |  |  | 
| 
                Proceeds from redemptions of available-for-sale marketable securities, at par 
               |  |  |  |  | — |  |  |  |  |  | 4,000 |  |  | 
| 
                Purchases of available-for-sale marketable securities 
               |  |  |  |  | (32,213) |  |  |  |  |  | (48,601) |  |  | 
| 
                Purchases of property and equipment 
               |  |  |  |  | (1,046) |  |  |  |  |  | (323) |  |  | 
| 
                Net cash provided by investing activities 
               |  |  |  |  | 43,741 |  |  |  |  |  | 73,666 |  |  | 
| Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Payments to royalty purchase and sale agreement 
               |  |  |  |  | (1,989) |  |  |  |  |  | — |  |  | 
| 
                Net proceeds from sales of common stock under open market sales 
                 agreement |  |  |  |  | — |  |  |  |  |  | 1,117 |  |  | 
| 
                Proceeds from the exercise of stock options 
               |  |  |  |  | — |  |  |  |  |  | 559 |  |  | 
| 
                Net cash (used in) provided by financing activities 
               |  |  |  |  | (1,989) |  |  |  |  |  | 1,676 |  |  | 
| 
                Net (decrease) increase in cash, cash equivalents and restricted cash 
               |  |  |  |  | (15,122) |  |  |  |  |  | 634 |  |  | 
| 
                Cash, cash equivalents and restricted cash at beginning of period 
               |  |  |  |  | 53,683 |  |  |  |  |  | 64,149 |  |  | 
| 
                Cash, cash equivalents and restricted cash at end of period 
               |  |  |  | $ | 38,561 |  |  |  |  | $ | 64,783 |  |  | 
| Noncash investing and financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Incremental right-of-use asset in exchange for non-cash lease liability from modification of lease 
               |  |  |  | $ | 3,417 |  |  |  |  | $ | — |  |  | 
| 
                Initial direct costs included as right-of-use asset from modification of lease 
               |  |  |  | $ | 577 |  |  |  |  | $ | — |  |  | 
| 
                Accrual for leasehold improvements 
               |  |  |  | $ | — |  |  |  |  | $ | 807 |  |  | 
| 
                Type of Security 
               |  |  | 
                Amortized
                 Cost |  |  | 
                Gross Unrealized 
               |  |  | 
                Estimated
                 Fair Value |  | |||||||||||||||
|  | 
                Gains 
               |  |  | 
                Losses 
               |  | ||||||||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | 5,000 |  |  |  |  | $ | — |  |  |  |  | $ | (25) |  |  |  |  | $ | 4,975 |  |  | 
| 
                Total available-for-sale marketable securities 
               |  |  |  | $ | 5,000 |  |  |  |  | $ | — |  |  |  |  | $ | (25) |  |  |  |  | $ | 4,975 |  |  | 
| 
                Type of Security 
               |  |  | 
                Amortized
                 Cost |  |  | 
                Gross Unrealized 
               |  |  | 
                Estimated
                 Fair Value |  | |||||||||||||||
|  | 
                Gains 
               |  |  | 
                Losses 
               |  | ||||||||||||||||||||
| 
                U.S. Treasury securities 
               |  |  |  | $ | 37,243 |  |  |  |  | $ | 3 |  |  |  |  | $ | — |  |  |  |  | $ | 37,246 |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 7,500 |  |  |  |  |  | — |  |  |  |  |  | (262) |  |  |  |  |  | 7,238 |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 4,500 |  |  |  |  |  | — |  |  |  |  |  | (1) |  |  |  |  |  | 4,499 |  |  | 
| 
                Total available-for-sale marketable securities 
               |  |  |  | $ | 49,243 |  |  |  |  | $ | 3 |  |  |  |  | $ | (263) |  |  |  |  | $ | 48,983 |  |  | 
|  |  |  | 
                Less than 12 Months 
               |  |  | 
                12 Months or Greater 
               |  |  | 
                Total 
               |  | |||||||||||||||||||||||||||
|  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  | ||||||||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 4,975 |  |  |  |  | $ | (25) |  |  |  |  | $ | 4,975 |  |  |  |  | $ | (25) |  |  | 
| 
                Total 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 4,975 |  |  |  |  | $ | (25) |  |  |  |  | $ | 4,975 |  |  |  |  | $ | (25) |  |  | 
|  |  |  | 
                Less than 12 Months 
               |  |  | 
                12 Months or Greater 
               |  |  | 
                Total 
               |  | |||||||||||||||||||||||||||
|  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  | ||||||||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 7,238 |  |  |  |  | $ | (262) |  |  |  |  | $ | 7,238 |  |  |  |  | $ | (262) |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2,000 |  |  |  |  |  | (1) |  |  |  |  |  | 2,000 |  |  |  |  |  | (1) |  |  | 
| 
                Total 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 9,238 |  |  |  |  | $ | (263) |  |  |  |  | $ | 9,238 |  |  |  |  | $ | (263) |  |  | 
|  |  |  | 
                As of September 30, 2024 
               |  |  | 
                As of December 31, 2023 
               |  | ||||||||||||||||||
| 
                Contractual maturity 
               |  |  | 
                Amortized
                 Cost |  |  | 
                Fair Value 
               |  |  | 
                Amortized
                 Cost |  |  | 
                Fair Value 
               |  | ||||||||||||
| 
                Less than one year 
               |  |  |  | $ | 5,000 |  |  |  |  | $ | 4,975 |  |  |  |  | $ | 49,243 |  |  |  |  | $ | 48,983 |  |  | 
| 
                More than one year 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total 
               |  |  |  | $ | 5,000 |  |  |  |  | $ | 4,975 |  |  |  |  | $ | 49,243 |  |  |  |  | $ | 48,983 |  |  | 
|  |  |  | 
                Total 
                 Accumulated Other Comprehensive Loss |  | |||
| 
                Balance, December 31, 2023 
               |  |  |  | $ | (260) |  |  | 
| 
                Other comprehensive income before reclassifications 
               |  |  |  |  | 235 |  |  | 
| 
                Amount reclassified from accumulated other comprehensive loss 
               |  |  |  |  | — |  |  | 
| 
                Net current period other comprehensive income 
               |  |  |  |  | 235 |  |  | 
| 
                Balance, September 30, 2024 
               |  |  |  | $ | (25) |  |  | 
| 
                Balance, December 31, 2022 
               |  |  |  | $ | (1,672) |  |  | 
| 
                Other comprehensive income before reclassifications 
               |  |  |  |  | 1,233 |  |  | 
| 
                Amount reclassified from accumulated other comprehensive loss 
               |  |  |  |  | — |  |  | 
| 
                Net current period other comprehensive income 
               |  |  |  |  | 1,233 |  |  | 
| 
                Balance, September 30, 2023 
               |  |  |  | $ | (439) |  |  | 
| 
                Type of Instrument 
               |  |  | 
                Total 
               |  |  | 
                Quoted prices in
                 active markets for identical assets (Level 1) |  |  | 
                Significant other
                 observable inputs (Level 2) |  |  | 
                Significant
                 unobservable inputs (Level 3) |  | ||||||||||||
| Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds and checking accounts 
               |  |  |  | $ | 37,061 |  |  |  |  | $ | 37,061 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 4,975 |  |  |  |  |  | — |  |  |  |  |  | 4,975 |  |  |  |  |  | — |  |  | 
| Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Commercial money market account 
               |  |  |  |  | 1,500 |  |  |  |  |  | 1,500 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 43,536 |  |  |  |  | $ | 38,561 |  |  |  |  | $ | 4,975 |  |  |  |  | $ | — |  |  | 
| 
                Type of Instrument 
               |  |  | 
                Total 
               |  |  | 
                Quoted prices in
                 active markets for identical assets (Level 1) |  |  | 
                Significant other
                 observable inputs (Level 2) |  |  | 
                Significant
                 unobservable inputs (Level 3) |  | ||||||||||||
| Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds and checking 
                 accounts |  |  |  | $ | 51,775 |  |  |  |  | $ | 51,775 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. Treasury securities 
               |  |  |  |  | 37,246 |  |  |  |  |  | — |  |  |  |  |  | 37,246 |  |  |  |  |  | — |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 7,238 |  |  |  |  |  | — |  |  |  |  |  | 7,238 |  |  |  |  |  | — |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 4,499 |  |  |  |  |  | — |  |  |  |  |  | 4,499 |  |  |  |  |  | — |  |  | 
| Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Commercial money market account 
               |  |  |  |  | 1,908 |  |  |  |  |  | 1,908 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 102,666 |  |  |  |  | $ | 53,683 |  |  |  |  | $ | 48,983 |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                September 30,
                 2024 |  |  | 
                December 31,
                 2023 |  | ||||||
| 
                Cash and cash equivalents 
               |  |  |  | $ | 37,061 |  |  |  |  | $ | 51,775 |  |  | 
| 
                Restricted cash, current assets 
               |  |  |  |  | 1,500 |  |  |  |  |  | 408 |  |  | 
| 
                Restricted cash, long-term assets 
               |  |  |  |  | — |  |  |  |  |  | 1,500 |  |  | 
| 
                Total cash, cash equivalents, and restricted cash shown in the Condensed Consolidated Statements of Cash Flows 
               |  |  |  | $ | 38,561 |  |  |  |  | $ | 53,683 |  |  | 
|  |  |  | 
                September 30,
                 2024 |  |  | 
                December 31,
                 2023 |  | ||||||
| 
                Raw materials 
               |  |  |  | $ | 2,124 |  |  |  |  | $ | 2,639 |  |  | 
| 
                Work-in-process 
               |  |  |  |  | 16 |  |  |  |  |  | 708 |  |  | 
|  |  |  |  |  | 2,140 |  |  |  |  |  | 3,347 |  |  | 
| 
                Less Inventory Reserve for Obsolescence 
               |  |  |  |  | (1,515) |  |  |  |  |  | (526) |  |  | 
| 
                Total 
               |  |  |  | $ | 625 |  |  |  |  | $ | 2,821 |  |  | 
|  |  |  | 
                September 30,
                 2024 |  |  | 
                December 31,
                 2023 |  | ||||||
| 
                Accounts payable 
               |  |  |  | $ | 2,541 |  |  |  |  | $ | 11,583 |  |  | 
| 
                Accrued research projects 
               |  |  |  |  | 1,490 |  |  |  |  |  | 4,343 |  |  | 
| 
                Accrued compensation and benefits 
               |  |  |  |  | 1,173 |  |  |  |  |  | 6,519 |  |  | 
| 
                Accrued professional fees and other 
               |  |  |  |  | 1,418 |  |  |  |  |  | 3,147 |  |  | 
| 
                Total 
               |  |  |  | $ | 6,622 |  |  |  |  | $ | 25,592 |  |  | 
|  | 
                Royalty purchase and sale agreement balance at December 31, 2023 
               |  |  |  | $ | 37,079 |  |  | 
|  | 
                Payments 
               |  |  |  |  | (1,989) |  |  | 
|  | 
                Non-cash interest expense 
               |  |  |  |  | 5,852 |  |  | 
|  | 
                October 1st payment included in accounts payable and accrued expenses 
               |  |  |  |  | (359) |  |  | 
|  | 
                Balance at September 30, 2024 
               |  |  |  | $ | 40,583 |  |  | 
|  | 
                Effective interest rate 
               |  |  |  |  | 20.90% |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||
| Collaborative revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (KORSUVA injection profit sharing) 
               |  |  |  | $ | 1,298 |  |  |  |  | $ | 1,932 |  |  |  |  | $ | 2,086 |  |  |  |  | $ | 10,092 |  |  | 
| 
                Maruishi 
               |  |  |  |  | — |  |  |  |  |  | 539 |  |  |  |  |  | — |  |  |  |  |  | 539 |  |  | 
| 
                Total collaborative revenue 
               |  |  |  | $ | 1,298 |  |  |  |  | $ | 2,471 |  |  |  |  | $ | 2,086 |  |  |  |  | $ | 10,631 |  |  | 
| Commercial supply revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (KORSUVA injection) 
               |  |  |  | $ | — |  |  |  |  | $ | 1,252 |  |  |  |  | $ | 640 |  |  |  |  | $ | 5,843 |  |  | 
| 
                Total commercial supply revenue 
               |  |  |  | $ | — |  |  |  |  | $ | 1,252 |  |  |  |  | $ | 640 |  |  |  |  | $ | 5,843 |  |  | 
| License and milestone fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Maruishi 
               |  |  |  | $ | — |  |  |  |  | $ | 910 |  |  |  |  | $ | — |  |  |  |  | $ | 910 |  |  | 
| 
                Total license and milestone fees 
               |  |  |  | $ | — |  |  |  |  | $ | 910 |  |  |  |  | $ | — |  |  |  |  | $ | 910 |  |  | 
| Royalty revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (Kapruvia ex-U.S.) 
               |  |  |  | $ | — |  |  |  |  | $ | 167 |  |  |  |  | $ | — |  |  |  |  | $ | 415 |  |  | 
| 
                Total royalty revenue 
               |  |  |  | $ | — |  |  |  |  | $ | 167 |  |  |  |  | $ | — |  |  |  |  | $ | 415 |  |  | 
| Clinical compound revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Maruishi 
               |  |  |  | $ | — |  |  |  |  | $ | 66 |  |  |  |  | $ | 84 |  |  |  |  | $ | 165 |  |  | 
| 
                Total clinical compound revenue 
               |  |  |  | $ | — |  |  |  |  | $ | 66 |  |  |  |  | $ | 84 |  |  |  |  | $ | 165 |  |  | 
| Other revenue (non-cash) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (Kapruvia ex-U.S.) 
               |  |  |  | $ | 435 |  |  |  |  | $ | — |  |  |  |  | $ | 1,084 |  |  |  |  | $ | — |  |  | 
| 
                Maruishi 
               |  |  |  |  | 823 |  |  |  |  |  | — |  |  |  |  |  | 1,788 |  |  |  |  |  | — |  |  | 
| 
                Total other revenue 
               |  |  |  | $ | 1,258 |  |  |  |  | $ | — |  |  |  |  | $ | 2,872 |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||||
| Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted average common shares outstanding 
               |  |  |  |  | 4,570,320 |  |  |  |  |  | 4,519,641 |  |  |  |  |  | 4,559,944 |  |  |  |  |  | 4,503,187 |  |  | 
| Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted average common shares outstanding – Basic 
               |  |  |  |  | 4,570,320 |  |  |  |  |  | 4,519,641 |  |  |  |  |  | 4,559,944 |  |  |  |  |  | 4,503,187 |  |  | 
| 
                Common stock equivalents* 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Denominator for diluted net loss per share 
               |  |  |  |  | 4,570,320 |  |  |  |  |  | 4,519,641 |  |  |  |  |  | 4,559,944 |  |  |  |  |  | 4,503,187 |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||||
| 
                Net loss – basic and diluted 
               |  |  |  | $ | (12,476) |  |  |  |  | $ | (28,032) |  |  |  |  | $ | (63,188) |  |  |  |  | $ | (86,176) |  |  | 
| Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and diluted 
               |  |  |  |  | 4,570,320 |  |  |  |  |  | 4,519,641 |  |  |  |  |  | 4,559,944 |  |  |  |  |  | 4,503,187 |  |  | 
| 
                Net loss per share, basic and diluted: 
               |  |  |  | $ | (2.73) |  |  |  |  | $ | (6.20) |  |  |  |  | $ | (13.86) |  |  |  |  | $ | (19.14) |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||||
| 
                Research and development 
               |  |  |  | $ | — |  |  |  |  | $ | 90 |  |  |  |  | $ | 249 |  |  |  |  | $ | 385 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 353 |  |  |  |  |  | 410 |  |  |  |  |  | 2,036 |  |  |  |  |  | 1,308 |  |  | 
| 
                Total restricted stock unit expense 
               |  |  |  | $ | 353 |  |  |  |  | $ | 500 |  |  |  |  | $ | 2,285 |  |  |  |  | $ | 1,693 |  |  | 
|  |  |  | 
                Number of
                 Units |  |  | 
                Weighted
                 Average Grant Date Fair Value |  | ||||||
| 
                Outstanding, December 31, 2023 
               |  |  |  |  | 47,194 |  |  |  |  | $ | 111.24 |  |  | 
| 
                Awarded 
               |  |  |  |  | 75,323 |  |  |  |  |  | 7.92 |  |  | 
| 
                Vested and released 
               |  |  |  |  | (30,494) |  |  |  |  |  | 93.72 |  |  | 
| 
                Forfeited 
               |  |  |  |  | (11,362) |  |  |  |  |  | 126.84 |  |  | 
| 
                Outstanding, September 30, 2024 
               |  |  |  |  | 80,661 |  |  |  |  | $ | 19.20 |  |  | 
| 
                Restricted stock units exercisable (vested and deferred), September 30, 2024 
               |  |  |  |  | — |  |  |  |  |  |  |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||
|  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||
| 
                Risk-free interest rate 
               |  |  | 
                N/A 
               |  |  | 
                4.20% 
               |  |  | 
                4.12% – 4.34% 
               |  |  | 
                3.38% – 4.22% 
               |  | 
| 
                Expected volatility 
               |  |  | 
                N/A 
               |  |  | 
                80.8% 
               |  |  | 
                89.6% – 89.8% 
               |  |  | 
                76.3% – 81.3% 
               |  | 
| 
                Expected dividend yield 
               |  |  | 
                N/A 
               |  |  | 
                0% 
               |  |  | 
                0% 
               |  |  | 
                0% 
               |  | 
| 
                Expected life of employee and Board options (in years) 
               |  |  | 
                N/A 
               |  |  | 
                6.25 
               |  |  | 
                6.25 
               |  |  | 
                6.25
               |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||
| 
                Research and development 
               |  |  |  | $ | 16 |  |  |  |  | $ | 1,387 |  |  |  |  | $ | 795 |  |  |  |  | $ | 4,314 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 1,120 |  |  |  |  |  | 1,447 |  |  |  |  |  | 3,494 |  |  |  |  |  | 4,122 |  |  | 
| 
                Total stock option expense 
               |  |  |  | $ | 1,136 |  |  |  |  | $ | 2,834 |  |  |  |  | $ | 4,289 |  |  |  |  | $ | 8,436 |  |  | 
|  |  |  | 
                Number of
                 Shares |  |  | 
                Weighted
                 Average Exercise Price |  | ||||||
| 
                Outstanding, December 31, 2023 
               |  |  |  |  | 658,138 |  |  |  |  | $ | 155.88 |  |  | 
| 
                Granted 
               |  |  |  |  | 253,760 |  |  |  |  |  | 10.32 |  |  | 
| 
                Exercised 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Forfeited 
               |  |  |  |  | (275,941) |  |  |  |  |  | 60.96 |  |  | 
| 
                Expired 
               |  |  |  |  | (280,993) |  |  |  |  |  | 179.04 |  |  | 
| 
                Outstanding, September 30, 2024 
               |  |  |  |  | 354,964 |  |  |  |  | $ | 107.40 |  |  | 
| 
                Options exercisable, September 30, 2024 
               |  |  |  |  | 190,407 |  |  |  |  |  |  |  |  | 
|  | 
                Total expense recorded in the three months ended March 31, 2024 
               |  |  |  | $ | 2,401 |  |  | 
|  | 
                Payments made in the three months ended March 31, 2024 
               |  |  |  |  | (1,702) |  |  | 
|  | 
                Remaining amounts to be paid as of March 31, 2024 
               |  |  |  |  | 699 |  |  | 
|  | 
                Total expense recorded in the three months ended June 30, 2024 
               |  |  |  |  | 2,581 |  |  | 
|  | 
                Payments made in the three months ended June 30, 2024 
               |  |  |  |  | (301) |  |  | 
|  | 
                Remaining amounts to be paid as of June 30, 2024 
               |  |  |  |  | 2,979 |  |  | 
|  | 
                Total expense recorded in the three months ended September 30, 2024 
               |  |  |  |  | 707 |  |  | 
|  | 
                Payments made in the three months ended September 30, 2024 
               |  |  |  |  | (3,400) |  |  | 
|  | 
                Remaining amounts to be paid as of September 30, 2024 
               |  |  |  | $ | 286 |  |  | 
|  |  |  | 
                Three Months Ended
                 September 30, |  |  | 
                Nine Months Ended
                 September 30, |  | ||||||||||||||||||
|  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||||
| 
                Cash paid for amounts included in the measurement of lease liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Operating cash outflows relating to operating leases 
               |  |  |  | $ | 4,363 |  |  |  |  | $ | 500 |  |  |  |  | $ | 4,363 |  |  |  |  | $ | 1,489 |  |  | 
| 
                ROU assets obtained in exchange for new operating lease liabilities 
               |  |  |  | $ | — |  |  |  |  | $ | 6,779 |  |  |  |  | $ | — |  |  |  |  | $ | 6,779 |  |  | 
| 
                Remaining lease term – operating leases (years) 
               |  |  |  |  | 0.1 |  |  |  |  |  | 10.4 |  |  |  |  |  | 0.1 |  |  |  |  |  | 10.4 |  |  | 
| 
                Discount rate – operating leases 
               |  |  |  |  | —% |  |  |  |  |  | 12.4% |  |  |  |  |  | —% |  |  |  |  |  | 12.4% |  |  | 
|  | 
                Description of the Matter
               |  |  | As discussed in Note 10 to the financial statements, on November 1, 2023, the Company entered into a Royalty Purchase and Sale Agreement (“royalty financing obligation”) with a third party, pursuant to which the Company sold certain of its rights to receive royalty and milestone payments in exchange for up to $40.0 million. The Company received initial upfront proceeds of $17.5 million, less certain expenses, followed by a $20.0 million milestone payment prior to December 31, 2023, based |  | 
|  |  |  |  | 
                on conditions met per the agreement. The Company will repay the lender at a multiple of the initial proceeds received, which may vary based on timing and amount of cash flows received from its licensing partners. The Company determined that the royalty financing should be treated as a financing arrangement under ASC 470 classified as a liability.
               
                Auditing the Company’s accounting for the royalty financing obligation was complex due to the judgment that was required in determining the balance sheet classification of the royalty financing obligation. 
               |  | 
|  | 
                How We Addressed the Matter in Our Audit
               |  |  | 
                We obtained an understanding, evaluated the design, and tested the operating effectiveness of controls that address the risk of material misstatement, including controls over management’s review of the terms and conditions of the royalty financing obligation agreement and the related accounting treatment.
               
                To audit the Company’s accounting related to the royalty financing, we evaluated the terms of the royalty financing obligation and the interpretation of the related accounting guidance to determine sale vs. financing and other underlying accounting conclusions. To test the initial classification of the royalty financing obligation, we performed audit procedures that included, among others, inspecting the agreements in order to evaluate the completeness and accuracy of contract terms included in the Company’s technical accounting analysis and testing management’s application of relevant accounting guidance, including balance sheet classification and disclosures.
               |  | 
|  |  |  | 
                December 31, 
                 2023 |  |  | 
                December 31, 
                 2022 |  | ||||||
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash and cash equivalents 
               |  |  |  | $ | 51,775 |  |  |  |  | $ | 63,741 |  |  | 
| 
                Marketable securities 
               |  |  |  |  | 48,983 |  |  |  |  |  | 81,658 |  |  | 
| 
                Accounts receivable, net – related party 
               |  |  |  |  | 2,765 |  |  |  |  |  | 3,260 |  |  | 
| 
                Inventory, net 
               |  |  |  |  | 2,821 |  |  |  |  |  | 2,383 |  |  | 
| 
                Income tax receivable 
               |  |  |  |  | 697 |  |  |  |  |  | 697 |  |  | 
| 
                Other receivables 
               |  |  |  |  | 555 |  |  |  |  |  | 496 |  |  | 
| 
                Prepaid expenses 
               |  |  |  |  | 8,154 |  |  |  |  |  | 16,267 |  |  | 
| 
                Restricted cash 
               |  |  |  |  | 408 |  |  |  |  |  | 408 |  |  | 
| 
                Total current assets 
               |  |  |  |  | 116,158 |  |  |  |  |  | 168,910 |  |  | 
| 
                Operating lease right-of-use assets 
               |  |  |  |  | 4,864 |  |  |  |  |  | 1,551 |  |  | 
| 
                Marketable securities, non-current 
               |  |  |  |  | — |  |  |  |  |  | 11,350 |  |  | 
| 
                Property and equipment, net 
               |  |  |  |  | 3,322 |  |  |  |  |  | 426 |  |  | 
| 
                Restricted cash, non-current 
               |  |  |  |  | 1,500 |  |  |  |  |  | — |  |  | 
| 
                Total assets 
               |  |  |  | $ | 125,844 |  |  |  |  | $ | 182,237 |  |  | 
| Liabilities and stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  | $ | 25,592 |  |  |  |  | $ | 21,540 |  |  | 
| 
                Operating lease liabilities, current 
               |  |  |  |  | — |  |  |  |  |  | 1,918 |  |  | 
| 
                Total current liabilities 
               |  |  |  |  | 25,592 |  |  |  |  |  | 23,458 |  |  | 
| 
                Liability related to sales of future royalties and milestones, net 
               |  |  |  |  | 37,079 |  |  |  |  |  | — |  |  | 
| 
                Operating lease liabilities, non-current 
               |  |  |  |  | 6,088 |  |  |  |  |  | — |  |  | 
| 
                Total liabilities 
               |  |  |  |  | 68,759 |  |  |  |  |  | 23,458 |  |  | 
| 
                Commitments and contingencies (Note 19) 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| Stockholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Preferred stock; $0.001 par value; 5,000,000 shares authorized at December 31, 2023 and December 31, 2022, zero shares issued and outstanding at December 31, 2023 and December 31, 2022 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Common stock; $0.001 par value; 8,333,333 shares authorized at 
                 December 31, 2023 and December 31, 2022, 4,540,059 shares and 4,483,112 shares issued and outstanding at December 31, 2023 and December 31, 2022, respectively |  |  |  |  | 5 |  |  |  |  |  | 4 |  |  | 
| 
                Additional paid-in capital 
               |  |  |  |  | 742,085 |  |  |  |  |  | 726,679 |  |  | 
| 
                Accumulated deficit 
               |  |  |  |  | (684,745) |  |  |  |  |  | (566,232) |  |  | 
| 
                Accumulated other comprehensive loss 
               |  |  |  |  | (260) |  |  |  |  |  | (1,672) |  |  | 
| 
                Total stockholders’ equity 
               |  |  |  |  | 57,085 |  |  |  |  |  | 158,779 |  |  | 
| 
                Total liabilities and stockholders’ equity 
               |  |  |  | $ | 125,844 |  |  |  |  | $ | 182,237 |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Collaborative revenue 
               |  |  |  | $ | 12,936 |  |  |  |  | $ | 16,572 |  |  |  |  | $ | 706 |  |  | 
| 
                Commercial supply revenue 
               |  |  |  |  | 5,843 |  |  |  |  |  | 10,223 |  |  |  |  |  | 701 |  |  | 
| 
                License and milestone fees 
               |  |  |  |  | 910 |  |  |  |  |  | 15,000 |  |  |  |  |  | 21,223 |  |  | 
| 
                Royalty revenue 
               |  |  |  |  | 415 |  |  |  |  |  | 72 |  |  |  |  |  | — |  |  | 
| 
                Clinical compound revenue 
               |  |  |  |  | 165 |  |  |  |  |  | — |  |  |  |  |  | 398 |  |  | 
| 
                Other revenue 
               |  |  |  |  | 699 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total revenue 
               |  |  |  |  | 20,968 |  |  |  |  |  | 41,867 |  |  |  |  |  | 23,028 |  |  | 
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cost of goods sold 
               |  |  |  |  | 6,174 |  |  |  |  |  | 7,266 |  |  |  |  |  | — |  |  | 
| 
                Research and development 
               |  |  |  |  | 108,510 |  |  |  |  |  | 91,879 |  |  |  |  |  | 82,701 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 27,779 |  |  |  |  |  | 30,257 |  |  |  |  |  | 29,410 |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 142,463 |  |  |  |  |  | 129,402 |  |  |  |  |  | 112,111 |  |  | 
| 
                Operating loss 
               |  |  |  |  | (121,495) |  |  |  |  |  | (87,535) |  |  |  |  |  | (89,083) |  |  | 
| 
                Other income, net 
               |  |  |  |  | 3,586 |  |  |  |  |  | 2,061 |  |  |  |  |  | 642 |  |  | 
| 
                Non-cash interest expense on liability related tosales of future royalties and milestones 
               |  |  |  |  | (604) |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Net loss 
               |  |  |  | $ | (118,513) |  |  |  |  | $ | (85,474) |  |  |  |  | $ | (88,441) |  |  | 
| Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  | $ | (26.26) |  |  |  |  | $ | (19.12) |  |  |  |  | $ | (20.93) |  |  | 
| Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and Diluted 
               |  |  |  |  | 4,512,422 |  |  |  |  |  | 4,471,130 |  |  |  |  |  | 4,226,564 |  |  | 
| Other comprehensive income (loss), net of tax of $0: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Change in unrealized gains (losses) on available-for-sale marketable 
                 securities |  |  |  |  | 1,412 |  |  |  |  |  | (1,314) |  |  |  |  |  | (431) |  |  | 
| 
                Total comprehensive loss 
               |  |  |  | $ | (117,101) |  |  |  |  | $ | (86,788) |  |  |  |  | $ | (88,872) |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
                Additional
                 Paid-In Capital |  |  | 
                Accumulated
                 Deficit |  |  | 
                Accumulated
                 Other Comprehensive Income (Loss) |  |  | 
                Total
                 Stockholders’ Equity |  | ||||||||||||
|  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||||||||||||||||
|  | 
                Common Stock 
               |  | |||||||||||||||||||||||||||||||||||
|  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||
| 
                Balance at December 31, 2020 
               |  |  |  |  | 4,156,017 |  |  |  |  | $ | 4 |  |  |  |  | $ | 641,241 |  |  |  |  | $ | (392,317) |  |  |  |  | $ | 73 |  |  |  |  | $ | 249,001 |  |  | 
| 
                Sale of common stock under license 
                 agreement with Vifor International ($182.76 per share) |  |  |  |  | 273,533 |  |  |  |  |  | — |  |  |  |  |  | 44,966 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 44,969 |  |  | 
| 
                Stock-based compensation 
                 expense |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 17,850 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 17,850 |  |  | 
| 
                Shares issued upon exercise of stock options 
               |  |  |  |  | 11,399 |  |  |  |  |  | — |  |  |  |  |  | 1,639 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,639 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 15,785 |  |  |  |  |  | — |  |  |  |  |  | 2,935 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2,935 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (88,441) |  |  |  |  |  | — |  |  |  |  |  | (88,441) |  |  | 
| 
                Other comprehensive loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (431) |  |  |  |  |  | (431) |  |  | 
| 
                Balance at December 31, 2021 
               |  |  |  |  | 4,456,734 |  |  |  |  | $ | 4 |  |  |  |  | $ | 708,634 |  |  |  |  | $ | (480,758) |  |  |  |  | $ | (358) |  |  |  |  | $ | 227,522 |  |  | 
| 
                Stock-based compensation 
                 expense |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 14,345 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 14,345 |  |  | 
| 
                Shares issued upon exercise of stock options 
               |  |  |  |  | 4,026 |  |  |  |  |  | — |  |  |  |  |  | 311 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 311 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 22,352 |  |  |  |  |  | — |  |  |  |  |  | 3,389 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3,389 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (85,474) |  |  |  |  |  | — |  |  |  |  |  | (85,474) |  |  | 
| 
                Other comprehensive loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (1,314) |  |  |  |  |  | (1,314) |  |  | 
| 
                Balance at December 31, 2022 
               |  |  |  |  | 4,483,112 |  |  |  |  | $ | 4 |  |  |  |  | $ | 726,679 |  |  |  |  | $ | (566,232) |  |  |  |  | $ | (1,672) |  |  |  |  | $ | 158,779 |  |  | 
| 
                Net proceeds from sales of common stock under open market sales agreement 
               |  |  |  |  | 32,240 |  |  |  |  |  | — |  |  |  |  |  | 1,117 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,117 |  |  | 
| 
                Stock-based compensation 
                 expense |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 12,710 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 12,710 |  |  | 
| 
                Shares issued upon exercise of stock options 
               |  |  |  |  | 7,768 |  |  |  |  |  | 1 |  |  |  |  |  | 559 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 560 |  |  | 
| 
                Shares issued upon vesting of restricted stock units 
               |  |  |  |  | 16,939 |  |  |  |  |  | — |  |  |  |  |  | 1,020 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,020 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (118,513) |  |  |  |  |  | — |  |  |  |  |  | (118,513) |  |  | 
| 
                Other comprehensive income 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 1,412 |  |  |  |  |  | 1,412 |  |  | 
| 
                Balance at December 31, 2023 
               |  |  |  |  | 4,540,059 |  |  |  |  | $ | 5 |  |  |  |  | $ | 742,085 |  |  |  |  | $ | (684,745) |  |  |  |  | $ | (260) |  |  |  |  | $ | 57,085 |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| Operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (118,513) |  |  |  |  | $ | (85,474) |  |  |  |  | $ | (88,441) |  |  | 
| 
                Adjustments to reconcile net loss to net cash used in operating activities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | 13,730 |  |  |  |  |  | 17,734 |  |  |  |  |  | 20,785 |  |  | 
| 
                Non-cash interest expense on liability related to sales of future royalties and milestones, net of issuance costs accretion 
               |  |  |  |  | 604 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Depreciation and amortization 
               |  |  |  |  | 259 |  |  |  |  |  | 248 |  |  |  |  |  | 248 |  |  | 
| 
                Noncash lease expense 
               |  |  |  |  | 2,075 |  |  |  |  |  | 1,422 |  |  |  |  |  | 1,306 |  |  | 
| 
                (Accretion)/amortization of available-for-sale marketable securities, net 
               |  |  |  |  | (400) |  |  |  |  |  | 264 |  |  |  |  |  | 861 |  |  | 
| 
                Realized gain on sale of available-for-sale marketable securities 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (39) |  |  | 
| 
                Realized gain on sale of property and equipment 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (70) |  |  | 
| 
                Changes in operating assets and liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts receivable, net – related party 
               |  |  |  |  | 495 |  |  |  |  |  | (3,260) |  |  |  |  |  | — |  |  | 
| 
                Inventory, net 
               |  |  |  |  | (438) |  |  |  |  |  | 201 |  |  |  |  |  | (2,584) |  |  | 
| 
                Income tax receivable 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 810 |  |  | 
| 
                Other receivables 
               |  |  |  |  | (59) |  |  |  |  |  | (41) |  |  |  |  |  | 102 |  |  | 
| 
                Prepaid expenses 
               |  |  |  |  | 8,113 |  |  |  |  |  | (13,748) |  |  |  |  |  | 9,557 |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  |  | 3,275 |  |  |  |  |  | 5,679 |  |  |  |  |  | (1,020) |  |  | 
| 
                Operating lease liabilities 
               |  |  |  |  | (1,918) |  |  |  |  |  | (1,755) |  |  |  |  |  | (1,602) |  |  | 
| 
                Reimbursement of lease incentive 
               |  |  |  |  | 807 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Other 
               |  |  |  |  | (108) |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Net cash used in operating activities 
               |  |  |  |  | (92,078) |  |  |  |  |  | (78,730) |  |  |  |  |  | (60,087) |  |  | 
| Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Proceeds from maturities of available-for-sale marketable securities 
               |  |  |  |  | 155,441 |  |  |  |  |  | 220,435 |  |  |  |  |  | 173,484 |  |  | 
| 
                Proceeds from redemptions of available-for-sale marketable securities, at par 
               |  |  |  |  | 4,000 |  |  |  |  |  | 4,000 |  |  |  |  |  | 20,500 |  |  | 
| 
                Proceeds from sale of available-for-sale marketable securities 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 10,029 |  |  | 
| 
                Purchases of available-for-sale marketable securities 
               |  |  |  |  | (113,605) |  |  |  |  |  | (95,685) |  |  |  |  |  | (208,795) |  |  | 
| 
                Purchases of property and equipment 
               |  |  |  |  | (2,375) |  |  |  |  |  | (43) |  |  |  |  |  | (39) |  |  | 
| 
                Proceeds from sale of property and equipment 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 70 |  |  | 
| 
                Net cash provided by (used in) investing activities 
               |  |  |  |  | 43,461 |  |  |  |  |  | 128,707 |  |  |  |  |  | (4,751) |  |  | 
| Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Proceeds from royalty purchase and sale agreement, net of $1.0 million of issuance 
                 costs |  |  |  |  | 36,474 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Net proceeds from sales of common stock under open market sales agreement 
               |  |  |  |  | 1,117 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Proceeds from the exercise of stock options 
               |  |  |  |  | 560 |  |  |  |  |  | 311 |  |  |  |  |  | 1,639 |  |  | 
| 
                Proceeds from the sale of common stock under license agreement with Vifor International 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 44,969 |  |  | 
| 
                Net cash provided by financing activities 
               |  |  |  |  | 38,151 |  |  |  |  |  | 311 |  |  |  |  |  | 46,608 |  |  | 
| 
                Net (decrease) increase in cash, cash equivalents and restricted cash 
               |  |  |  |  | (10,466) |  |  |  |  |  | 50,288 |  |  |  |  |  | (18,230) |  |  | 
| 
                Cash, cash equivalents and restricted cash at beginning of period 
               |  |  |  |  | 64,149 |  |  |  |  |  | 13,861 |  |  |  |  |  | 32,091 |  |  | 
| 
                Cash, cash equivalents and restricted cash at end of period 
               |  |  |  | $ | 53,683 |  |  |  |  | $ | 64,149 |  |  |  |  | $ | 13,861 |  |  | 
| Noncash investing and financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accrual for leasehold improvements 
               |  |  |  | $ | 778 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Revenue 
               |  | |||||||||||||||
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| License Agreement Partner: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor* 
               |  |  |  |  | 92% |  |  |  |  |  | 100% |  |  |  |  |  | 92% |  |  | 
| 
                Asset Category 
               |  |  | 
                Useful Lives 
               |  | 
| Computer and office equipment |  |  | 
                5 years 
               |  | 
| Furniture and fixtures |  |  | 
                7 years 
               |  | 
| Leasehold improvements |  |  | 
                lesser of useful life of asset or life of lease (Stamford – 11 years)
               |  | 
|  |  |  |  |  |  |  |  |  | 
                Gross Unrealized 
               |  |  | 
                Estimated Fair
                 Value |  | ||||||||||||
| 
                Type of Security 
               |  |  | 
                Amortized Cost 
               |  |  | 
                Gains 
               |  |  | 
                Losses 
               |  | |||||||||||||||
| 
                U.S. Treasury securities 
               |  |  |  | $ | 37,243 |  |  |  |  | $ | 3 |  |  |  |  | $ | — |  |  |  |  | $ | 37,246 |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 7,500 |  |  |  |  |  | — |  |  |  |  |  | (262) |  |  |  |  |  | 7,238 |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 4,500 |  |  |  |  |  | — |  |  |  |  |  | (1) |  |  |  |  |  | 4,499 |  |  | 
| 
                Total available-for-sale marketable securities 
               |  |  |  | $ | 49,243 |  |  |  |  | $ | 3 |  |  |  |  | $ | (263) |  |  |  |  | $ | 48,983 |  |  | 
|  |  |  |  |  |  |  |  |  | 
                Gross Unrealized 
               |  |  | 
                Estimated Fair
                 Value |  | ||||||||||||
| 
                Type of Security 
               |  |  | 
                Amortized Cost 
               |  |  | 
                Gains 
               |  |  | 
                Losses 
               |  | |||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | 9,500 |  |  |  |  | $ | — |  |  |  |  | $ | (623) |  |  |  |  | $ | 8,877 |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 35,828 |  |  |  |  |  | — |  |  |  |  |  | (643) |  |  |  |  |  | 35,185 |  |  | 
| 
                Commercial paper 
               |  |  |  |  | 26,879 |  |  |  |  |  | 2 |  |  |  |  |  | (6) |  |  |  |  |  | 26,875 |  |  | 
| 
                Municipal bonds 
               |  |  |  |  | 22,473 |  |  |  |  |  | — |  |  |  |  |  | (402) |  |  |  |  |  | 22,071 |  |  | 
| 
                Total available-for-sale marketable securities 
               |  |  |  | $ | 94,680 |  |  |  |  | $ | 2 |  |  |  |  | $ | (1,674) |  |  |  |  | $ | 93,008 |  |  | 
|  |  |  | 
                Less than 12 Months 
               |  |  | 
                12 Months or Greater 
               |  |  | 
                Total 
               |  | |||||||||||||||||||||||||||
|  |  |  | 
                Fair 
                 Value |  |  | 
                Gross 
                 Unrealized Losses |  |  | 
                Fair 
                 Value |  |  | 
                Gross 
                 Unrealized Losses |  |  | 
                Fair 
                 Value |  |  | 
                Gross 
                 Unrealized Losses |  | ||||||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 7,238 |  |  |  |  | $ | (262) |  |  |  |  | $ | 7,238 |  |  |  |  | $ | (262) |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2,000 |  |  |  |  |  | (1) |  |  |  |  |  | 2,000 |  |  |  |  |  | (1) |  |  | 
| 
                Total 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 9,238 |  |  |  |  | $ | (263) |  |  |  |  | $ | 9,238 |  |  |  |  | $ | (263) |  |  | 
|  |  |  | 
                Less than 12 Months 
               |  |  | 
                12 Months or Greater 
               |  |  | 
                Total 
               |  | |||||||||||||||||||||||||||
|  |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  |  | 
                Fair
                 Value |  |  | 
                Gross
                 Unrealized Losses |  | ||||||||||||||||||
| 
                U.S. government agency obligations 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 8,877 |  |  |  |  | $ | (623) |  |  |  |  | $ | 8,877 |  |  |  |  | $ | (623) |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 1,470 |  |  |  |  |  | (26) |  |  |  |  |  | 33,715 |  |  |  |  |  | (617) |  |  |  |  |  | 35,185 |  |  |  |  |  | (643) |  |  | 
| 
                Commercial paper 
               |  |  |  |  | 15,906 |  |  |  |  |  | (6) |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 15,906 |  |  |  |  |  | (6) |  |  | 
| 
                Municipal bonds 
               |  |  |  |  | 982 |  |  |  |  |  | (16) |  |  |  |  |  | 19,589 |  |  |  |  |  | (386) |  |  |  |  |  | 20,571 |  |  |  |  |  | (402) |  |  | 
| 
                Total 
               |  |  |  | $ | 18,358 |  |  |  |  | $ | (48) |  |  |  |  | $ | 62,181 |  |  |  |  | $ | (1,626) |  |  |  |  | $ | 80,539 |  |  |  |  | $ | (1,674) |  |  | 
|  |  |  | 
                As of December 31, 2023 
               |  |  | 
                As of December 31, 2022 
               |  | ||||||||||||||||||
| 
                Contractual maturity 
               |  |  | 
                Amortized Cost 
               |  |  | 
                Fair Value 
               |  |  | 
                Amortized Cost 
               |  |  | 
                Fair Value 
               |  | ||||||||||||
| 
                Less than one year 
               |  |  |  | $ | 49,243 |  |  |  |  | $ | 48,983 |  |  |  |  | $ | 82,678 |  |  |  |  | $ | 81,658 |  |  | 
| 
                One year to two years 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 12,002 |  |  |  |  |  | 11,350 |  |  | 
| 
                Total 
               |  |  |  | $ | 49,243 |  |  |  |  | $ | 48,983 |  |  |  |  | $ | 94,680 |  |  |  |  | $ | 93,008 |  |  | 
|  |  |  | 
                Total Accumulated
                 Other Comprehensive Income (Loss) |  | |||
| 
                Balance, December 31, 2020 
               |  |  |  | $ | 73 |  |  | 
| 
                Other comprehensive loss before reclassifications 
               |  |  |  |  | (392) |  |  | 
| 
                Amount reclassified from accumulated other comprehensive income 
               |  |  |  |  | (39) |  |  | 
| 
                Net current period other comprehensive loss 
               |  |  |  |  | (431) |  |  | 
| 
                Balance, December 31, 2021 
               |  |  |  |  | (358) |  |  | 
| 
                Other comprehensive loss before reclassifications 
               |  |  |  |  | (1,314) |  |  | 
| 
                Amount reclassified from accumulated other comprehensive loss 
               |  |  |  |  | — |  |  | 
| 
                Net current period other comprehensive loss 
               |  |  |  |  | (1,314) |  |  | 
| 
                Balance, December 31, 2022 
               |  |  |  | $ | (1,672) |  |  | 
| 
                Other comprehensive income before reclassifications 
               |  |  |  |  | 1,412 |  |  | 
| 
                Amount reclassified from accumulated other comprehensive loss 
               |  |  |  |  | — |  |  | 
| 
                Net current period other comprehensive income 
               |  |  |  |  | 1,412 |  |  | 
| 
                Balance, December 31, 2023 
               |  |  |  | $ | (260) |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  |  | 
                Affected Line Item in the 
                 Consolidated Statements of Comprehensive Loss |  | |||||||||||||||
| 
                Component of Accumulated Other Comprehensive Income (Loss) 
               |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | ||||||||||||
| 
                Unrealized gains on available-for-sale marketable securities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Realized gains on sales of securities 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 39 |  |  |  | Other income, net |  | 
| 
                Income tax effect 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 
                Benefit from income taxes 
               |  | 
| 
                Realized gains on sales of securities, net of tax 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 39 |  |  |  |  |  | 
|  |  |  | 
                December 31, 2023 
               |  |  | 
                December 31, 2022 
               |  | ||||||
| 
                Raw materials 
               |  |  |  | $ | 2,639 |  |  |  |  | $ | 1,918 |  |  | 
| 
                Work-in-process 
               |  |  |  |  | 708 |  |  |  |  |  | 499 |  |  | 
|  |  |  |  |  | 3,347 |  |  |  |  |  | 2,417 |  |  | 
| 
                Less Inventory Reserve for Obsolescence 
               |  |  |  |  | (526) |  |  |  |  |  | (34) |  |  | 
| 
                Total 
               |  |  |  | $ | 2,821 |  |  |  |  | $ | 2,383 |  |  | 
|  |  |  | 
                December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Computer and office equipment 
               |  |  |  | $ | 239 |  |  |  |  | $ | 239 |  |  | 
| 
                Furniture and fixtures 
               |  |  |  |  | 596 |  |  |  |  |  | 330 |  |  | 
| 
                Leasehold improvements 
               |  |  |  |  | 4,154 |  |  |  |  |  | 1,266 |  |  | 
|  |  |  |  | $ | 4,989 |  |  |  |  | $ | 1,835 |  |  | 
| 
                Less accumulated depreciation and amortization 
               |  |  |  |  | (1,667) |  |  |  |  |  | (1,409) |  |  | 
| 
                Property and equipment, net 
               |  |  |  | $ | 3,322 |  |  |  |  | $ | 426 |  |  | 
|  |  |  | 
                December 31, 2023 
               |  |  | 
                December 31, 2022 
               |  | ||||||
| 
                Cash and cash equivalents 
               |  |  |  | $ | 51,775 |  |  |  |  | $ | 63,741 |  |  | 
| 
                Restricted cash, current assets 
               |  |  |  |  | 408 |  |  |  |  |  | 408 |  |  | 
| 
                Restricted cash, long-term assets 
               |  |  |  |  | 1,500 |  |  |  |  |  | — |  |  | 
| 
                Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows 
               |  |  |  | $ | 53,683 |  |  |  |  | $ | 64,149 |  |  | 
|  |  |  | 
                December 31, 2023 
               |  |  | 
                December 31, 2022 
               |  | ||||||
| 
                Accounts payable 
               |  |  |  | $ | 11,583 |  |  |  |  | $ | 9,604 |  |  | 
| 
                Accrued research projects 
               |  |  |  |  | 4,343 |  |  |  |  |  | 5,200 |  |  | 
| 
                Accrued compensation and benefits 
               |  |  |  |  | 6,519 |  |  |  |  |  | 5,219 |  |  | 
| 
                Accrued professional fees and other 
               |  |  |  |  | 3,147 |  |  |  |  |  | 1,517 |  |  | 
| 
                Total 
               |  |  |  | $ | 25,592 |  |  |  |  | $ | 21,540 |  |  | 
|  | 
                HCR Agreement (including milestone payment received in December 2023) 
               |  |  |  | $ | 37,500 |  |  | 
|  | 
                Issuance costs 
               |  |  |  |  | (1,025) |  |  | 
|  | 
                Non-cash interest expense 
               |  |  |  |  | 604 |  |  | 
|  | 
                Balance at December 31, 2023 
               |  |  |  | $ | 37,079 |  |  | 
|  | 
                Effective interest rate 
               |  |  |  |  | 22.6% |  |  | 
| 
                Type of Instrument 
               |  |  | 
                Total 
               |  |  | 
                Quoted prices in
                 active markets for identical assets (Level 1) |  |  | 
                Significant other
                 observable inputs (Level 2) |  |  | 
                Significant
                 unobservable inputs (Level 3) |  | ||||||||||||
| Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds and checking accounts 
               |  |  |  | $ | 51,775 |  |  |  |  | $ | 51,775 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. Treasury securities 
               |  |  |  |  | 37,246 |  |  |  |  |  | — |  |  |  |  |  | 37,246 |  |  |  |  |  | — |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 7,238 |  |  |  |  |  | — |  |  |  |  |  | 7,238 |  |  |  |  |  | — |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 4,499 |  |  |  |  |  | — |  |  |  |  |  | 4,499 |  |  |  |  |  | — |  |  | 
| Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Commercial money market account 
               |  |  |  |  | 1,908 |  |  |  |  |  | 1,908 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 102,666 |  |  |  |  | $ | 53,683 |  |  |  |  | $ | 48,983 |  |  |  |  | $ | — |  |  | 
| 
                Type of Instrument 
               |  |  | 
                Total 
               |  |  | 
                Quoted prices in
                 active markets for identical assets (Level 1) |  |  | 
                Significant other
                 observable inputs (Level 2) |  |  | 
                Significant
                 unobservable inputs (Level 3) |  | ||||||||||||
| Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds and checking accounts 
               |  |  |  | $ | 63,741 |  |  |  |  | $ | 63,741 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. government agency obligations 
               |  |  |  |  | 8,877 |  |  |  |  |  | — |  |  |  |  |  | 8,877 |  |  |  |  |  | — |  |  | 
| 
                Corporate bonds 
               |  |  |  |  | 35,185 |  |  |  |  |  | — |  |  |  |  |  | 35,185 |  |  |  |  |  | — |  |  | 
| 
                Commercial paper 
               |  |  |  |  | 26,875 |  |  |  |  |  | — |  |  |  |  |  | 26,875 |  |  |  |  |  | — |  |  | 
| 
                Municipal bonds 
               |  |  |  |  | 22,071 |  |  |  |  |  | — |  |  |  |  |  | 22,071 |  |  |  |  |  | — |  |  | 
| Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Commercial money market account 
               |  |  |  |  | 408 |  |  |  |  |  | 408 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 157,157 |  |  |  |  | $ | 64,149 |  |  |  |  | $ | 93,008 |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| Collaborative revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (KORSUVA injection profit sharing) 
               |  |  |  | $ | 12,397 |  |  |  |  | $ | 16,572 |  |  |  |  | $ | — |  |  | 
| 
                Maruishi 
               |  |  |  |  | 539 |  |  |  |  |  | — |  |  |  |  |  | 706 |  |  | 
| 
                Total collaborative revenue 
               |  |  |  | $ | 12,936 |  |  |  |  | $ | 16,572 |  |  |  |  | $ | 706 |  |  | 
| Commercial supply revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor* (KORSUVA injection) 
               |  |  |  | $ | 5,843 |  |  |  |  | $ | 10,223 |  |  |  |  | $ | 701 |  |  | 
| 
                Total commercial supply revenue 
               |  |  |  | $ | 5,843 |  |  |  |  | $ | 10,223 |  |  |  |  | $ | 701 |  |  | 
| License and milestone fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor* 
               |  |  |  | $ | — |  |  |  |  | $ | 15,000 |  |  |  |  | $ | 20,031 |  |  | 
| 
                Maruishi 
               |  |  |  |  | 910 |  |  |  |  |  | — |  |  |  |  |  | 1,192 |  |  | 
| 
                Total license and milestone fees 
               |  |  |  | $ | 910 |  |  |  |  | $ | 15,000 |  |  |  |  | $ | 21,223 |  |  | 
| Royalty revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (Kapruvia ex U.S.) 
               |  |  |  | $ | 415 |  |  |  |  | $ | 72 |  |  |  |  | $ | — |  |  | 
| 
                Total royalty revenue 
               |  |  |  | $ | 415 |  |  |  |  | $ | 72 |  |  |  |  | $ | — |  |  | 
| Clinical compound revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor* (difelikefalin injection) 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 361 |  |  | 
| 
                Maruishi 
               |  |  |  |  | 165 |  |  |  |  |  | — |  |  |  |  |  | 37 |  |  | 
| 
                Total clinical compound revenue 
               |  |  |  | $ | 165 |  |  |  |  | $ | — |  |  |  |  | $ | 398 |  |  | 
| Other revenue (non-cash) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                CSL Vifor (Kapruvia ex U.S.) 
               |  |  |  | $ | 284 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| 
                Maruishi 
               |  |  |  |  | 415 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Total other revenue 
               |  |  |  | $ | 699 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Number of
                 Units |  |  | 
                Weighted
                 Average Grant Date Fair Value |  | ||||||
| 
                Outstanding, December 31, 2022 
               |  |  |  |  | 31,043 |  |  |  |  | $ | 158.40 |  |  | 
| 
                Awarded 
               |  |  |  |  | 50,098 |  |  |  |  |  | 93.72 |  |  | 
| 
                Vested and released 
               |  |  |  |  | (16,939) |  |  |  |  |  | 149.52 |  |  | 
| 
                Forfeited 
               |  |  |  |  | (17,008) |  |  |  |  |  | 107.52 |  |  | 
| 
                Outstanding, December 31, 2023 
               |  |  |  |  | 47,194 |  |  |  |  | $ | 111.24 |  |  | 
| 
                Restricted stock units exercisable (vested and deferred), December 31, 2023 
               |  |  |  |  | — |  |  |  |  |  |  |  |  | 
|  |  |  | 
                Number of
                 Shares |  |  | 
                Weighted
                 Average Exercise Price |  |  | 
                Aggregate
                 Intrinsic Value |  | |||||||||
| 
                Outstanding, December 31, 2022 
               |  |  |  |  | 640,787 |  |  |  |  | $ | 172.20 |  |  |  |  |  |  |  |  | 
| 
                Granted 
               |  |  |  |  | 167,056 |  |  |  |  |  | 97.80 |  |  |  |  |  |  |  |  | 
| 
                Exercised 
               |  |  |  |  | (7,768) |  |  |  |  |  | 72.00 |  |  |  |  |  |  |  |  | 
| 
                Forfeited 
               |  |  |  |  | (23,836) |  |  |  |  |  | 111.00 |  |  |  |  |  |  |  |  | 
| 
                Expired 
               |  |  |  |  | (118,101) |  |  |  |  |  | 176.88 |  |  |  |  |  |  |  |  | 
| 
                Outstanding, December 31, 2023 
               |  |  |  |  | 658,138 |  |  |  |  | $ | 155.88 |  |  |  |  | $ | — |  |  | 
| 
                Weighted average remaining contractual life as of December 31, 2023 (in years) 
               |  |  |  |  | 6.71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Options exercisable, December 31, 2023 
               |  |  |  |  | 403,337 |  |  |  |  | $ | 176.28 |  |  |  |  | $ | — |  |  | 
| 
                Weighted average remaining contractual life as of December 31, 2023 (in years) 
               |  |  |  |  | 5.46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Options vested and expected to vest as of December 31, 2023 
               |  |  |  |  | 658,138 |  |  |  |  | $ | 155.88 |  |  |  |  | $ | — |  |  | 
| 
                Weighted average remaining contractual life as of December 31, 2023 (in years) 
               |  |  |  |  | 6.71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | ||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | 
| 
                Risk-free interest rate 
               |  |  | 
                3.38% – 4.65% 
               |  |  | 
                1.70% – 4.21% 
               |  |  | 
                0.66% – 1.41% 
               |  | 
| 
                Expected volatility 
               |  |  | 
                76.3% – 81.3% 
               |  |  | 
                77.7% – 81.9% 
               |  |  | 
                71.6% – 83.5% 
               |  | 
| 
                Expected dividend yield 
               |  |  | 
                0% 
               |  |  | 
                0% 
               |  |  | 
                0% 
               |  | 
| 
                Expected life of employee and Board options (in years) 
               |  |  | 
                6.25 
               |  |  | 
                6.25 
               |  |  | 
                6.25
               |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| 
                Research and development 
               |  |  |  | $ | 5,973 |  |  |  |  | $ | 7,222 |  |  |  |  | $ | 7,126 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 5,634 |  |  |  |  |  | 6,426 |  |  |  |  |  | 9,569 |  |  | 
| 
                Total stock option expense 
               |  |  |  | $ | 11,607 |  |  |  |  | $ | 13,648 |  |  |  |  | $ | 16,695 |  |  | 
|  |  |  | 
                December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Federal 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
| 
                State 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
|  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| Deferred: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Federal 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                State 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
|  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Benefit from income taxes 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| 
                Income taxes using U.S. federal statutory rate 
               |  |  |  |  | 21.00% |  |  |  |  |  | 21.00% |  |  |  |  |  | 21.00% |  |  | 
| 
                State income taxes, net of federal benefit 
               |  |  |  |  | 5.30% |  |  |  |  |  | (1.00)% |  |  |  |  |  | 7.84% |  |  | 
| 
                Impact of R&D tax credit on effective tax rate 
               |  |  |  |  | 3.68% |  |  |  |  |  | 4.91% |  |  |  |  |  | 2.87% |  |  | 
| 
                Stock option shortfalls and cancellations 
               |  |  |  |  | (1.22)% |  |  |  |  |  | (3.33)% |  |  |  |  |  | (4.74)% |  |  | 
| 
                Permanent items and other 
               |  |  |  |  | (0.89)% |  |  |  |  |  | (1.86)% |  |  |  |  |  | (1.29)% |  |  | 
| 
                Change in valuation allowance 
               |  |  |  |  | (27.34)% |  |  |  |  |  | (19.88)% |  |  |  |  |  | (25.69)% |  |  | 
| 
                Provision to return 
               |  |  |  |  | (0.53)% |  |  |  |  |  | 0.16% |  |  |  |  |  | 0.01% |  |  | 
|  |  |  |  |  | 0.00% |  |  |  |  |  | 0.00% |  |  |  |  |  | 0.00% |  |  | 
|  |  |  | 
                December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Valuation allowance 
               |  |  |  | $ | (192,791) |  |  |  |  | $ | (160,814) |  |  | 
| 
                Net operating loss carryforwards 
               |  |  |  |  | 123,739 |  |  |  |  |  | 113,058 |  |  | 
| 
                Federal and state tax credits 
               |  |  |  |  | 31,245 |  |  |  |  |  | 26,358 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | 3,855 |  |  |  |  |  | 3,434 |  |  | 
| 
                Intangible asset amortization 
               |  |  |  |  | 33,162 |  |  |  |  |  | 17,265 |  |  | 
| 
                Other 
               |  |  |  |  | 2,101 |  |  |  |  |  | 1,167 |  |  | 
| 
                Deferred tax assets 
               |  |  |  |  | 194,102 |  |  |  |  |  | 161,282 |  |  | 
| 
                Other 
               |  |  |  |  | (1,311) |  |  |  |  |  | (468) |  |  | 
| 
                Deferred tax liabilities: 
               |  |  |  |  | (1,311) |  |  |  |  |  | (468) |  |  | 
| 
                Net deferred tax asset: 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted average common shares outstanding 
               |  |  |  |  | 4,512,422 |  |  |  |  |  | 4,471,130 |  |  |  |  |  | 4,226,564 |  |  | 
| Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted average common shares outstanding – Basic 
               |  |  |  |  | 4,512,422 |  |  |  |  |  | 4,471,130 |  |  |  |  |  | 4,226,564 |  |  | 
| 
                Common stock equivalents* 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Denominator for diluted net loss per share 
               |  |  |  |  | 4,512,422 |  |  |  |  |  | 4,471,130 |  |  |  |  |  | 4,226,564 |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2021 
               |  | |||||||||
| 
                Net loss – basic and diluted 
               |  |  |  | $ | (118,513) |  |  |  |  | $ | (85,474) |  |  |  |  | $ | (88,441) |  |  | 
| Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Basic and diluted 
               |  |  |  |  | 4,512,422 |  |  |  |  |  | 4,471,130 |  |  |  |  |  | 4,226,564 |  |  | 
| 
                Net loss per share, basic and diluted: 
               |  |  |  | $ | (26.26) |  |  |  |  | $ | (19.12) |  |  |  |  | $ | (20.93) |  |  | 
|  |  |  | 
                Year Ended December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Operating cash outflows relating to operating leases 
               |  |  |  | $ | 1,992 |  |  |  |  | $ | 1,957 |  |  | 
| 
                ROU assets obtained in exchange for new operating lease liabilities 
               |  |  |  | $ | 6,779 |  |  |  |  | $ | — |  |  | 
| 
                Remaining lease term – operating leases (years) 
               |  |  |  |  | 10.8 |  |  |  |  |  | 1.0 |  |  | 
| 
                Discount rate – operating leases 
               |  |  |  |  | 12.8% |  |  |  |  |  | 7.0% |  |  | 
|  | Year Ending December 31, |  |  |  |  |  |  |  | 
|  | 
                2024 
               |  |  |  | $ | 108 |  |  | 
|  | 
                2025 
               |  |  |  |  | 1,298 |  |  | 
|  | 
                2026 
               |  |  |  |  | 1,330 |  |  | 
|  | 
                2027 
               |  |  |  |  | 1,363 |  |  | 
|  | 
                2028 
               |  |  |  |  | 1,398 |  |  | 
|  | 
                Thereafter 
               |  |  |  |  | 8,874 |  |  | 
|  | 
                Total future minimum lease payments, undiscounted 
               |  |  |  |  | 14,371 |  |  | 
|  | 
                Less imputed interest 
               |  |  |  |  | (7,336) |  |  | 
|  | 
                Less lease incentive to be reimbursed 
               |  |  |  |  | (947) |  |  | 
|  | 
                Total 
               |  |  |  | $ | 6,088 |  |  | 
|  | Operating lease liability reported as of December 31, 2023: |  |  |  |  |  |  |  | 
|  | 
                Operating lease liability – current 
               |  |  |  | $ | — |  |  | 
|  | 
                Operating lease liability – non-current 
               |  |  |  |  | 6,088 |  |  | 
|  | 
                Total 
               |  |  |  | $ | 6,088 |  |  | 
|  |  |  | 
                As of December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash and cash equivalents 
               |  |  |  | $ | 22,919 |  |  |  |  | $ | 21,489 |  |  | 
| 
                Short-term investments 
               |  |  |  |  | — |  |  |  |  |  | 22,250 |  |  | 
| 
                Prepaid expenses and other current assets 
               |  |  |  |  | 3,239 |  |  |  |  |  | 370 |  |  | 
| 
                Total current assets 
               |  |  |  |  | 26,158 |  |  |  |  |  | 44,109 |  |  | 
| 
                Property and equipment, net 
               |  |  |  |  | 116 |  |  |  |  |  | 147 |  |  | 
| 
                Intangible assets, net 
               |  |  |  |  | 448 |  |  |  |  |  | 511 |  |  | 
| 
                Operating lease right-of-use assets 
               |  |  |  |  | 262 |  |  |  |  |  | 313 |  |  | 
| 
                Other non-current assets 
               |  |  |  |  | 17 |  |  |  |  |  | 17 |  |  | 
| 
                Total assets 
               |  |  |  | $ | 27,001 |  |  |  |  | $ | 45,097 |  |  | 
| Liabilities, Redeemable Convertible Preferred Stock, and Stockholders’ Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts payable 
               |  |  |  | $ | 1,611 |  |  |  |  | $ | 2,409 |  |  | 
| 
                Accrued expenses 
               |  |  |  |  | 1,577 |  |  |  |  |  | 1,786 |  |  | 
| 
                Operating lease liabilities, current portion 
               |  |  |  |  | 93 |  |  |  |  |  | 82 |  |  | 
| 
                Total current liabilities 
               |  |  |  |  | 3,281 |  |  |  |  |  | 4,277 |  |  | 
| 
                Operating lease liabilities, net of current portion 
               |  |  |  |  | 275 |  |  |  |  |  | 368 |  |  | 
| 
                Total liabilities 
               |  |  |  |  | 3,556 |  |  |  |  |  | 4,645 |  |  | 
| Commitments and contingencies (Note 13) |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Redeemable convertible preferred stock (Series A, B), $0.001 par value; 29,723,540 shares authorized as of December 31, 2023 and 2022; 29,555,538 shares issued and outstanding as of December 31, 2023 and 2022; aggregate liquidation preference of $85,902 as of December 31, 2023 and 2022 
               |  |  |  |  | 85,503 |  |  |  |  |  | 85,503 |  |  | 
| Stockholders’ Deficit: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Common stock, $0.001 par value; 58,251,629 shares authorized as of December 31, 2023 and 2022; 19,134,164 and 19,127,914 shares issued and outstanding as of December 31, 2023 and 2022, respectively; 
               |  |  |  |  | 19 |  |  |  |  |  | 19 |  |  | 
| 
                Additional paid-in capital 
               |  |  |  |  | 762 |  |  |  |  |  | 446 |  |  | 
| 
                Accumulated other comprehensive loss 
               |  |  |  |  | — |  |  |  |  |  | (24) |  |  | 
| 
                Accumulated deficit 
               |  |  |  |  | (62,839) |  |  |  |  |  | (45,492) |  |  | 
| 
                Total stockholders’ deficit 
               |  |  |  |  | (62,058) |  |  |  |  |  | (45,051) |  |  | 
| 
                Total liabilities, redeemable convertible preferred stock, and stockholders’ deficit 
               |  |  |  | $ | 27,001 |  |  |  |  | $ | 45,097 |  |  | 
|  |  |  | 
                For the Year Ended December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  | $ | 15,866 |  |  |  |  | $ | 18,466 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 2,799 |  |  |  |  |  | 2,727 |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 18,665 |  |  |  |  |  | 21,193 |  |  | 
| 
                Loss from operations 
               |  |  |  |  | (18,665) |  |  |  |  |  | (21,193) |  |  | 
| Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Interest income 
               |  |  |  |  | 1,318 |  |  |  |  |  | 654 |  |  | 
| 
                Interest expense 
               |  |  |  |  | — |  |  |  |  |  | (3) |  |  | 
| 
                Total other income, net 
               |  |  |  |  | 1,318 |  |  |  |  |  | 651 |  |  | 
| 
                Net loss 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,542) |  |  | 
| 
                Net loss per share attributable to common stockholders, basic and 
                 diluted |  |  |  | $ | (0.91) |  |  |  |  | $ | (1.07) |  |  | 
| 
                Weighted-average common shares outstanding, basic and diluted 
               |  |  |  |  | 19,134,096 |  |  |  |  |  | 19,116,342 |  |  | 
| Comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,542) |  |  | 
| 
                Unrealized loss on short-term investments 
               |  |  |  |  | — |  |  |  |  |  | (24) |  |  | 
| 
                Comprehensive loss 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,566) |  |  | 
|  |  |  | 
                Redeemable 
                 Convertible Preferred Stock |  |  |  | 
                Common 
                 Stock |  |  | 
                Additional 
                 Paid-In Capital |  |  | 
                Accumulated 
                 Deficit |  |  | 
                Accumulated 
                 Other Comprehensive Loss |  |  | 
                Total 
                 Stockholders’ Deficit |  | ||||||||||||||||||||||||||||||
|  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||||||
| 
                Balances as of January 1, 2022
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,096,873 |  |  |  |  | $ | 19 |  |  |  |  | $ | 196 |  |  |  |  | $ | (24,950) |  |  |  |  | $ | — |  |  |  |  | $ | (24,735) |  |  | 
| 
                Exercise of stock options 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | 31,041 |  |  |  |  |  | — |  |  |  |  |  | 4 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 4 |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 246 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 246 |  |  | 
| 
                Unrealized loss on short-term 
                 investments |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (24) |  |  |  |  |  | (24) |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (20,542) |  |  |  |  |  |  |  |  |  |  |  | (20,542) |  |  | 
| 
                Balances as of December 31, 2022
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,127,914 |  |  |  |  | $ | 19 |  |  |  |  | $ | 446 |  |  |  |  | $ | (45,492) |  |  |  |  | $ | (24) |  |  |  |  | $ | (45,051) |  |  | 
| 
                Exercise of stock options 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | 6,250 |  |  |  |  |  | — |  |  |  |  |  | 2 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2 |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 314 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 314 |  |  | 
| 
                Maturities of short-term investments 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 24 |  |  |  |  |  | 24 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (17,347) |  |  |  |  |  | — |  |  |  |  |  | (17,347) |  |  | 
| 
                Balances as of December 31, 2023
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,134,164 |  |  |  |  | $ | 19 |  |  |  |  | $ | 762 |  |  |  |  | $ | (62,839) |  |  |  |  | $ | — |  |  |  |  | $ | (62,058) |  |  | 
|  |  |  | 
                For the Year Ended December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,542) |  |  | 
| Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Depreciation and amortization expense 
               |  |  |  |  | 95 |  |  |  |  |  | 85 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | 314 |  |  |  |  |  | 246 |  |  | 
| 
                Non-cash lease expense 
               |  |  |  |  | 51 |  |  |  |  |  | 34 |  |  | 
| 
                Accretion of discounts on short-term investments 
               |  |  |  |  | (194) |  |  |  |  |  | (355) |  |  | 
| 
                Changes in operating assets and liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Prepaid expenses and other assets 
               |  |  |  |  | (2,869) |  |  |  |  |  | 478 |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  |  | (1,008) |  |  |  |  |  | 2,195 |  |  | 
| 
                Operating lease liabilities 
               |  |  |  |  | (82) |  |  |  |  |  | (7) |  |  | 
| 
                Net cash used in operating activities 
               |  |  |  |  | (21,040) |  |  |  |  |  | (17,866) |  |  | 
| Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Purchases of property and equipment 
               |  |  |  |  | — |  |  |  |  |  | (50) |  |  | 
| 
                Purchases of short-term investments 
               |  |  |  |  | — |  |  |  |  |  | (43,995) |  |  | 
| 
                Maturities of short-term investments 
               |  |  |  |  | 22,468 |  |  |  |  |  | 22,045 |  |  | 
| 
                Net cash provided by (used in) investing activities 
               |  |  |  |  | 22,468 |  |  |  |  |  | (22,000) |  |  | 
| Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Proceeds from exercise of stock options 
               |  |  |  |  | 2 |  |  |  |  |  | 4 |  |  | 
| 
                Net cash provided by financing activities 
               |  |  |  |  | 2 |  |  |  |  |  | 4 |  |  | 
| 
                Net increase (decrease) in cash and cash equivalents 
               |  |  |  |  | 1,430 |  |  |  |  |  | (39,862) |  |  | 
| 
                Cash and cash equivalents–beginning of year 
               |  |  |  |  | 21,489 |  |  |  |  |  | 61,351 |  |  | 
| 
                Cash and cash equivalents–end of year 
               |  |  |  | $ | 22,919 |  |  |  |  | $ | 21,489 |  |  | 
| Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Leasehold improvements 
               |  |  |  | $ | — |  |  |  |  | $ | 119 |  |  | 
| Supplemental cash flow information: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Obtaining an operating lease right-of-use asset in exchange for an operating lease liability 
               |  |  |  | $ | — |  |  |  |  | $ | 347 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  |  | 
                As of 
                 December 31, |  | ||||||||||||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||||||||
|  |  |  | 
                % of operating 
                 expenses |  |  | 
                % of accounts 
                 payable |  | ||||||||||||||||||
| 
                Vendor A 
               |  |  |  |  | 33% |  |  |  |  |  | 28% |  |  |  |  |  | 40% |  |  |  |  |  | 42% |  |  | 
| 
                Vendor B 
               |  |  |  |  | 14% |  |  |  |  |  | 9% |  |  |  |  |  | — |  |  |  |  |  | 27% |  |  | 
| 
                Vendor C 
               |  |  |  |  | 8% |  |  |  |  |  | 7% |  |  |  |  |  | 10% |  |  |  |  |  | 8% |  |  | 
| 
                Vendor D 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 19% |  |  |  |  |  | — |  |  | 
|  |  |  |  |  | 55% |  |  |  |  |  | 44% |  |  |  |  |  | 69% |  |  |  |  |  | 77% |  |  | 
|  |  |  | 
                Estimated Useful Life 
               |  | 
| Computer equipment |  |  | 
                3 years 
               |  | 
| Office equipment |  |  | 
                5 years 
               |  | 
| Leasehold improvements |  |  | 
                Shorter of remaining lease term or estimated useful life
               |  | 
|  |  |  | 
                As of December 31, 2023 
               |  | |||||||||||||||||||||
|  |  |  | 
                Level 1 
               |  |  | 
                Level 2 
               |  |  | 
                Level 3 
               |  |  | 
                Total 
               |  | ||||||||||||
| Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash equivalents: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds 
               |  |  |  | $ | 21,762 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 21,762 |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 21,762 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 21,762 |  |  | 
|  |  |  | 
                As of December 31, 2022 
               |  | |||||||||||||||||||||
|  |  |  | 
                Level 1 
               |  |  | 
                Level 2 
               |  |  | 
                Level 3 
               |  |  | 
                Total 
               |  | ||||||||||||
| Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash equivalents: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds 
               |  |  |  | $ | 20,388 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 20,388 |  |  | 
| 
                Short-term investments 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. Treasury Notes 
               |  |  |  |  | 22,250 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 22,250 |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 42,638 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 42,638 |  |  | 
|  |  |  | 
                As of December 31, 2022 
               |  | |||||||||||||||||||||
|  |  |  | 
                Amortized 
                 Cost |  |  | 
                Unrealized 
                 Gains |  |  | 
                Unrealized 
                 Losses |  |  | 
                Fair Value 
               |  | ||||||||||||
| Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                U.S. Treasury Notes 
               |  |  |  | $ | 22,274 |  |  |  |  | $ | 8 |  |  |  |  | $ | (32) |  |  |  |  | $ | 22,250 |  |  | 
| 
                Total short-term investments 
               |  |  |  | $ | 22,274 |  |  |  |  | $ | 8 |  |  |  |  | $ | (32) |  |  |  |  | $ | 22,250 |  |  | 
|  |  |  | 
                December 31, 
                 2022 |  | |||
| 
                Due within one year 
               |  |  |  | $ | 22,250 |  |  | 
|  |  |  | 
                As of December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Prepaid research and development expenses 
               |  |  |  | $ | 3,203 |  |  |  |  | $ | 314 |  |  | 
| 
                Other prepaid expenses 
               |  |  |  |  | 36 |  |  |  |  |  | 56 |  |  | 
| 
                Total prepaid expenses and other current assets 
               |  |  |  | $ | 3,239 |  |  |  |  | $ | 370 |  |  | 
|  |  |  | 
                As of December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Licensed patent rights 
               |  |  |  | $ | 826 |  |  |  |  | $ | 826 |  |  | 
| 
                Less: accumulated amortization 
               |  |  |  |  | (378) |  |  |  |  | $ | (315) |  |  | 
| 
                Total intangible assets, net 
               |  |  |  | $ | 448 |  |  |  |  | $ | 511 |  |  | 
| 
                Year Ended December 31, 
               |  |  | 
                Amount 
               |  | |||
| 
                2024 
               |  |  |  | $ | 63 |  |  | 
| 
                2025 
               |  |  |  |  | 63 |  |  | 
| 
                2026 
               |  |  |  |  | 63 |  |  | 
| 
                2027 
               |  |  |  |  | 63 |  |  | 
| 
                2028 
               |  |  |  |  | 63 |  |  | 
| 
                Thereafter 
               |  |  |  |  | 133 |  |  | 
| 
                Total 
               |  |  |  | $ | 448 |  |  | 
|  |  |  | 
                As of December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Accrued research and development expenses 
               |  |  |  | $ | 574 |  |  |  |  | $ | 899 |  |  | 
| 
                Accrued employee compensation and benefits 
               |  |  |  |  | 942 |  |  |  |  |  | 678 |  |  | 
| 
                Other accrued expenses 
               |  |  |  |  | 61 |  |  |  |  |  | 209 |  |  | 
| 
                Total accrued expenses 
               |  |  |  | $ | 1,577 |  |  |  |  | $ | 1,786 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Lease costs: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Operating lease cost 
               |  |  |  | $ | 90 |  |  |  |  | $ | 67 |  |  | 
| 
                Variable lease cost 
               |  |  |  |  | 83 |  |  |  |  |  | 25 |  |  | 
| 
                Total lease costs 
               |  |  |  | $ | 173 |  |  |  |  |  | 92 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Operating cash flows from operating leases 
               |  |  |  | $ | 194 |  |  |  |  | $ | 64 |  |  | 
| 
                Operating lease right-of-use assets obtained in exchange for new operating lease liabilities 
               |  |  |  | $ | — |  |  |  |  | $ | 347 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Weighted-average discount rate 
               |  |  |  |  | 9.50% |  |  |  |  |  | 9.50% |  |  | 
| 
                Weighted-average remaining lease term 
               |  |  |  |  | 3.67 |  |  |  |  |  | 4.67 |  |  | 
| 
                Year Ended December 31, 
               |  |  | 
                Amount 
               |  | |||
| 
                2024 
               |  |  |  | $ | 123 |  |  | 
| 
                2025 
               |  |  |  |  | 94 |  |  | 
| 
                2026 
               |  |  |  |  | 129 |  |  | 
| 
                2027 
               |  |  |  |  | 88 |  |  | 
| 
                Total lease payments 
               |  |  |  |  | 434 |  |  | 
| 
                Less: imputed interest 
               |  |  |  |  | (66) |  |  | 
| 
                Present value of lease liabilities 
               |  |  |  |  | 368 |  |  | 
| 
                Less: operating lease liabilities, current portion 
               |  |  |  | $ | 93 |  |  | 
| 
                Operating lease liabilities, net of current portion 
               |  |  |  | $ | 275 |  |  | 
|  |  |  | 
                Par Value 
               |  |  | 
                Preferred Stock 
                 Authorized |  |  | 
                Preferred Stock 
                 Issued and Outstanding |  |  | 
                Carrying
                 Value |  |  | 
                Liquidation 
                 Preference |  |  | 
                Common Stock 
                 Issuable Upon Conversion |  | ||||||||||||||||||
| 
                Series A preferred stock 
               |  |  |  | $ | 0.001 |  |  |  |  |  | 9,499,999 |  |  |  |  |  | 9,499,999 |  |  |  |  | $ | 9,327 |  |  |  |  | $ | 9,500 |  |  |  |  |  | 9,499,999 |  |  | 
| 
                Series B preferred stock 
               |  |  |  |  | 0.001 |  |  |  |  |  | 20,223,541 |  |  |  |  |  | 20,055,539 |  |  |  |  |  | 76,176 |  |  |  |  |  | 76,402 |  |  |  |  |  | 20,055,539 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 29,723,540 |  |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  | $ | 85,902 |  |  |  |  |  | 29,555,538 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Per share fair value of common stock 
               |  |  |  | $ | 0.52 |  |  |  |  | $ | 0.37 |  |  | 
| 
                Expected volatility 
               |  |  |  |  | 67.4% |  |  |  |  |  | 60.4% |  |  | 
| 
                Expected dividends 
               |  |  |  |  | 0% |  |  |  |  |  | 0% |  |  | 
| 
                Expected term (in years) 
               |  |  |  |  | 6.1 |  |  |  |  |  | 6.0 |  |  | 
| 
                Risk-free rate 
               |  |  |  |  | 3.56% |  |  |  |  |  | 2.11% |  |  | 
|  |  |  | 
                Number of 
                 Options |  |  | 
                Weighted-
                 Average Exercise Price |  |  | 
                Weighted-
                 Average Remaining Contractual Term (In Years) |  |  | 
                Intrinsic Value 
                 (In Thousands) |  | ||||||||||||
| 
                Outstanding as of January 1, 2023 
               |  |  |  |  | 4,828,500 |  |  |  |  | $ | 0.37 |  |  |  |  |  | 7.75 |  |  |  |  | $ | 2,152 |  |  | 
| 
                Granted 
               |  |  |  |  | 687,129 |  |  |  |  |  | 0.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Exercised 
               |  |  |  |  | (6,250) |  |  |  |  |  | 0.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Outstanding as of December 31, 2023 
               |  |  |  |  | 5,509,379 |  |  |  |  | $ | 0.43 |  |  |  |  |  | 7.04 |  |  |  |  | $ | 2,699 |  |  | 
| 
                Options exercisable as of December 31, 2023 
               |  |  |  |  | 3,658,422 |  |  |  |  | $ | 0.30 |  |  |  |  |  | 6.35 |  |  |  |  | $ | 2,264 |  |  | 
| 
                Vested and expected to vest as of December 31, 2023 
               |  |  |  |  | 5,509,379 |  |  |  |  | $ | 0.43 |  |  |  |  |  | 7.04 |  |  |  |  | $ | 2,699 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Research and development 
               |  |  |  | $ | 111 |  |  |  |  | $ | 37 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 203 |  |  |  |  |  | 209 |  |  | 
| 
                Total stock-based compensation 
               |  |  |  | $ | 314 |  |  |  |  | $ | 246 |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Income tax at U.S. federal statutory rate 
               |  |  |  | $ | (3,643) |  |  |  |  | $ | (4,314) |  |  | 
| 
                State taxes, net of federal benefit 
               |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
                Valuation allowance 
               |  |  |  |  | 3,604 |  |  |  |  |  | 4,312 |  |  | 
| 
                Other 
               |  |  |  |  | 39 |  |  |  |  |  | 2 |  |  | 
| 
                Total income tax 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                December 31, 
               |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Federal net operating loss carryforwards 
               |  |  |  | $ | 7,235 |  |  |  |  | $ | 5,882 |  |  | 
| 
                Capitalized research and development expense 
               |  |  |  |  | 5,665 |  |  |  |  |  | 3,470 |  |  | 
| 
                Tax credits 
               |  |  |  |  | 417 |  |  |  |  | $ | 417 |  |  | 
| 
                Other 
               |  |  |  |  | 100 |  |  |  |  |  | 43 |  |  | 
| 
                Net deferred tax assets before valuation allowance 
               |  |  |  |  | 13,417 |  |  |  |  |  | 9,812 |  |  | 
| 
                Valuation allowance 
               |  |  |  |  | (13,417) |  |  |  |  |  | (9,812) |  |  | 
| 
                Net deferred tax assets after valuation allowance 
               |  |  |  | $ | — |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss attributable to common stockholders 
               |  |  |  | $ | (17,347) |  |  |  |  | $ | (20,542) |  |  | 
| Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted-average common shares outstanding, basic and diluted 
               |  |  |  |  | 19,134,096 |  |  |  |  |  | 19,116,342 |  |  | 
| 
                Net loss per share attributable to common stockholders, basic and 
                 diluted |  |  |  | $ | (0.91) |  |  |  |  | $ | (1.07) |  |  | 
|  |  |  | 
                For the Year Ended 
                 December 31, |  | |||||||||
|  |  |  | 
                2023 
               |  |  | 
                2022 
               |  | ||||||
| 
                Preferred stock (as converted to common stock) 
               |  |  |  |  | 29,555,538 |  |  |  |  |  | 29,555,538 |  |  | 
| 
                Stock options to purchase common stock 
               |  |  |  |  | 5,509,379 |  |  |  |  |  | 4,828,500 |  |  | 
|  |  |  | 
                As of 
                 September 30, 2024 |  |  | 
                As of 
                 December 31, 2023 |  | ||||||
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash and cash equivalents 
               |  |  |  | $ | 9,438 |  |  |  |  | $ | 22,919 |  |  | 
| 
                Prepaid expenses and other current assets 
               |  |  |  |  | 1,265 |  |  |  |  |  | 3,239 |  |  | 
| 
                Total current assets 
               |  |  |  |  | 10,703 |  |  |  |  |  | 26,158 |  |  | 
| 
                Property and equipment, net 
               |  |  |  |  | 92 |  |  |  |  |  | 116 |  |  | 
| 
                Intangible assets, net 
               |  |  |  |  | 401 |  |  |  |  |  | 448 |  |  | 
| 
                Operating lease right-of-use assets 
               |  |  |  |  | 218 |  |  |  |  |  | 262 |  |  | 
| 
                Deferred offering costs 
               |  |  |  |  | 1,083 |  |  |  |  |  | — |  |  | 
| 
                Other non-current assets 
               |  |  |  |  | 17 |  |  |  |  |  | 17 |  |  | 
| 
                Total assets 
               |  |  |  | $ | 12,514 |  |  |  |  | $ | 27,001 |  |  | 
| Liabilities, Redeemable Convertible Preferred Stock, and Stockholders’ Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Accounts payable 
               |  |  |  | $ | 1,978 |  |  |  |  |  | 1,611 |  |  | 
| 
                Accrued expenses 
               |  |  |  |  | 3,237 |  |  |  |  |  | 1,577 |  |  | 
| 
                Operating lease liabilities, current portion 
               |  |  |  |  | 92 |  |  |  |  |  | 93 |  |  | 
| 
                Total current liabilities 
               |  |  |  |  | 5,307 |  |  |  |  |  | 3,281 |  |  | 
| 
                Operating lease liabilities, net of current portion 
               |  |  |  |  | 207 |  |  |  |  |  | 275 |  |  | 
| 
                Total liabilities 
               |  |  |  |  | 5,514 |  |  |  |  |  | 3,556 |  |  | 
| Commitments and contingencies (Note 13) |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Redeemable convertible preferred stock (Series A, B), $0.001 par value; 29,723,540 shares authorized as of September 30, 2024 and December 31, 2023; 29,555,538 shares issued and outstanding as of September 30, 2024 and December 31, 2023; aggregate liquidation preference of $85,902 as of September 30, 2024 and December 31, 2023 
               |  |  |  |  | 85,503 |  |  |  |  |  | 85,503 |  |  | 
| Stockholders’ Deficit: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Common stock, $0.001 par value; 58,251,629 shares authorized as of 
                 September 30, 2024 and December 31, 2023; 19,197,914 and 19,134,164 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively |  |  |  |  | 19 |  |  |  |  |  | 19 |  |  | 
| 
                Additional paid-in capital 
               |  |  |  |  | 1,007 |  |  |  |  |  | 762 |  |  | 
| 
                Accumulated deficit 
               |  |  |  |  | (79,529) |  |  |  |  |  | (62,839) |  |  | 
| 
                Total stockholders’ deficit 
               |  |  |  |  | (78,503) |  |  |  |  |  | (62,058) |  |  | 
| 
                Total liabilities, redeemable convertible preferred stock, and stockholders’ deficit 
               |  |  |  | $ | 12,514 |  |  |  |  | $ | 27,001 |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Research and development 
               |  |  |  | $ | 15,047 |  |  |  |  | $ | 11,884 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 2,258 |  |  |  |  |  | 2,117 |  |  | 
| 
                Total operating expenses 
               |  |  |  |  | 17,305 |  |  |  |  |  | 14,001 |  |  | 
| 
                Loss from operations 
               |  |  |  |  | (17,305) |  |  |  |  |  | (14,001) |  |  | 
| 
                Interest income 
               |  |  |  |  | 615 |  |  |  |  |  | 1,005 |  |  | 
| 
                Net loss 
               |  |  |  | $ | (16,690) |  |  |  |  | $ | (12,996) |  |  | 
| 
                Net loss per share attributable to common stockholders, basic and diluted 
               |  |  |  | $ | (0.87) |  |  |  |  | $ | (0.68) |  |  | 
| 
                Weighted-average common shares outstanding, basic and diluted 
               |  |  |  |  | 19,192,595 |  |  |  |  |  | 19,134,072 |  |  | 
|  |  |  | 
                Redeemable Convertible 
                 Preferred Stock |  |  |  | 
                Common Stock 
               |  |  | 
                Additional 
                 Paid-In Capital |  |  | 
                Accumulated 
                 Deficit |  |  | 
                Accumulated 
                 Other Comprehensive Loss |  |  | 
                Total 
                 Stockholders’ Deficit |  | ||||||||||||||||||||||||||||||
|  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||||||
| 
                Balances as of January 1, 2024
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,134,164 |  |  |  |  | $ | 19 |  |  |  |  | $ | 762 |  |  |  |  | $ | (62,839) |  |  |  |  | $ | — |  |  |  |  | $ | (62,058) |  |  | 
| 
                Exercise of stock options 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | 63,750 |  |  |  |  |  | — |  |  |  |  |  | 5 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 5 |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 240 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 240 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (16,690) |  |  |  |  |  | — |  |  |  |  |  | (16,690) |  |  | 
| 
                Balances as of September 30, 2024
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,197,914 |  |  |  |  | $ | 19 |  |  |  |  | $ | 1,007 |  |  |  |  | $ | (79,529) |  |  |  |  | $ | — |  |  |  |  | $ | (78,503) |  |  | 
|  |  |  | 
                Redeemable Convertible 
                 Preferred Stock |  |  |  | 
                Common Stock 
               |  |  | 
                Additional 
                 Paid-In Capital |  |  | 
                Accumulated 
                 Deficit |  |  | 
                Accumulated 
                 Other Comprehensive Loss |  |  | 
                Total 
                 Stockholders’ Deficit |  | ||||||||||||||||||||||||||||||
|  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  |  |  | 
                Shares 
               |  |  | 
                Amount 
               |  | ||||||||||||||||||||||||||||||||||||
| 
                Balances as of January 1, 2023
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,127,914 |  |  |  |  | $ | 19 |  |  |  |  | $ | 446 |  |  |  |  | $ | (45,492) |  |  |  |  | $ | (24) |  |  |  |  | $ | (45,051) |  |  | 
| 
                Exercise of stock options 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | 6,250 |  |  |  |  |  | — |  |  |  |  |  | 2 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 2 |  |  | 
| 
                Stock-based compensation 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 229 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 229 |  |  | 
| 
                Maturities of short-term 
                 investments |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 24 |  |  |  |  |  | 24 |  |  | 
| 
                Net loss 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | (12,996) |  |  |  |  |  | — |  |  |  |  |  | (12,996) |  |  | 
| 
                Balances as of September 30, 2023
               |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  |  |  | 19,134,164 |  |  |  |  | $ | 19 |  |  |  |  | $ | 677 |  |  |  |  | $ | (58,488) |  |  |  |  | $ | — |  |  |  |  | $ | (57,792) |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss 
               |  |  |  | $ | (16,690) |  |  |  |  | $ | (12,996) |  |  | 
| Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Depreciation and amortization expense 
               |  |  |  |  | 71 |  |  |  |  |  | 71 |  |  | 
| 
                Stock-based compensation expense 
               |  |  |  |  | 240 |  |  |  |  |  | 229 |  |  | 
| 
                Non-cash lease expense 
               |  |  |  |  | 44 |  |  |  |  |  | 38 |  |  | 
| 
                Accretion of discounts on short-term investments 
               |  |  |  |  | — |  |  |  |  |  | (194) |  |  | 
| 
                Changes in operating assets and liabilities: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Prepaid expenses and other assets 
               |  |  |  |  | 1,974 |  |  |  |  |  | (3,269) |  |  | 
| 
                Accounts payable and accrued expenses 
               |  |  |  |  | 958 |  |  |  |  |  | 890 |  |  | 
| 
                Operating lease liabilities 
               |  |  |  |  | (69) |  |  |  |  |  | (60) |  |  | 
| 
                Net cash used in operating activities 
               |  |  |  |  | (13,472) |  |  |  |  |  | (15,291) |  |  | 
| Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Maturities of short-term investments 
               |  |  |  |  | — |  |  |  |  |  | 22,468 |  |  | 
| 
                Net cash provided by investing activities 
               |  |  |  |  | — |  |  |  |  |  | 22,468 |  |  | 
| Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Proceeds from exercise of stock options 
               |  |  |  |  | 5 |  |  |  |  |  | 2 |  |  | 
| 
                Payments of deferred offering costs 
               |  |  |  |  | (14) |  |  |  |  |  | — |  |  | 
| 
                Net cash (used in) provided by financing activities 
               |  |  |  |  | (9) |  |  |  |  |  | 2 |  |  | 
| 
                Net (decrease) increase in cash and cash equivalents 
               |  |  |  |  | (13,481) |  |  |  |  |  | 7,179 |  |  | 
| 
                Cash and cash equivalents – beginning of year 
               |  |  |  |  | 22,919 |  |  |  |  |  | 21,489 |  |  | 
| 
                Cash and cash equivalents – end of year 
               |  |  |  | $ | 9,438 |  |  |  |  | $ | 28,668 |  |  | 
| Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Deferred offering costs included in accounts payable and accrued expenses 
               |  |  |  | $ | 1,069 |  |  |  |  | $ | — |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  |  | 
                As of 
                 September 30, |  |  | 
                As of 
                 December 31, |  | |||||||||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||||||||
|  |  |  | 
                % of operating 
                 expenses |  |  | 
                % of accounts 
                 payable |  | ||||||||||||||||||
| 
                Vendor A 
               |  |  |  |  | 62% |  |  |  |  |  | 37% |  |  |  |  |  | 83% |  |  |  |  |  | 40% |  |  | 
| 
                Vendor B 
               |  |  |  |  | — |  |  |  |  |  | 18% |  |  |  |  |  | 2% |  |  |  |  |  | — |  |  | 
| 
                Vendor C 
               |  |  |  |  | 2% |  |  |  |  |  | 11% |  |  |  |  |  | — |  |  |  |  |  | 10% |  |  | 
| 
                Vendor D 
               |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 19% |  |  | 
|  |  |  |  |  | 64% |  |  |  |  |  | 66% |  |  |  |  |  | 85% |  |  |  |  |  | 69% |  |  | 
|  |  |  | 
                As of September 30, 2024 
               |  | |||||||||||||||||||||
|  |  |  | 
                Level 1 
               |  |  | 
                Level 2 
               |  |  | 
                Level 3 
               |  |  | 
                Total 
               |  | ||||||||||||
| Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash equivalents: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds 
               |  |  |  | $ | 8,827 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 8,827 |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 8,827 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 8,827 |  |  | 
|  |  |  | 
                As of December 31, 2023 
               |  | |||||||||||||||||||||
|  |  |  | 
                Level 1 
               |  |  | 
                Level 2 
               |  |  | 
                Level 3 
               |  |  | 
                Total 
               |  | ||||||||||||
| Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Cash equivalents: 
               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Money market funds 
               |  |  |  | $ | 21,762 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 21,762 |  |  | 
| 
                Total financial assets 
               |  |  |  | $ | 21,762 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 21,762 |  |  | 
|  |  |  | 
                As of 
                 September 30, 2024 |  |  | 
                As of 
                 December 31, 2023 |  | ||||||
| 
                Prepaid research and development expenses 
               |  |  |  | $ | 1,212 |  |  |  |  | $ | 3,203 |  |  | 
| 
                Other prepaid expenses 
               |  |  |  |  | 53 |  |  |  |  |  | 36 |  |  | 
| 
                Total prepaid expenses and other current assets 
               |  |  |  | $ | 1,265 |  |  |  |  | $ | 3,239 |  |  | 
|  |  |  | 
                As of 
                 September 30, 2024 |  |  | 
                As of 
                 December 31, 2023 |  | ||||||
| 
                Licensed patent rights 
               |  |  |  | $ | 826 |  |  |  |  | $ | 826 |  |  | 
| 
                Less: accumulated amortization 
               |  |  |  |  | (425) |  |  |  |  |  | (378) |  |  | 
| 
                Total intangible assets, net 
               |  |  |  | $ | 401 |  |  |  |  | $ | 448 |  |  | 
| 
                Year Ended December 31, 
               |  |  | 
                Amount 
               |  | |||
| 
                Remainder of 2024 
               |  |  |  | $ | 16 |  |  | 
| 
                2025 
               |  |  |  |  | 63 |  |  | 
| 
                2026 
               |  |  |  |  | 63 |  |  | 
| 
                2027 
               |  |  |  |  | 63 |  |  | 
| 
                2028 
               |  |  |  |  | 63 |  |  | 
| 
                Thereafter 
               |  |  |  |  | 133 |  |  | 
| 
                Total 
               |  |  |  | $ | 401 |  |  | 
|  |  |  | 
                As of 
                 September 30, 2024 |  |  | 
                As of 
                 December 31, 2023 |  | ||||||
| 
                Accrued research and development expenses 
               |  |  |  | $ | 1,008 |  |  |  |  | $ | 574 |  |  | 
| 
                Accrued employee compensation and benefits 
               |  |  |  |  | 1,185 |  |  |  |  |  | 942 |  |  | 
| 
                Other accrued expenses 
               |  |  |  |  | 1,044 |  |  |  |  |  | 61 |  |  | 
| 
                Total accrued expenses 
               |  |  |  | $ | 3,237 |  |  |  |  | $ | 1,577 |  |  | 
|  |  |  | 
                For the Nine Months 
                 Ended September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| Lease costs: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Operating lease cost 
               |  |  |  | $ | 67 |  |  |  |  | $ | 67 |  |  | 
| 
                Variable lease cost 
               |  |  |  |  | 59 |  |  |  |  |  | 63 |  |  | 
| 
                Total lease costs 
               |  |  |  | $ | 126 |  |  |  |  |  | 130 |  |  | 
|  |  |  | 
                For the Nine Months 
                 Ended September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| 
                Operating cash flows from operating leases 
               |  |  |  | $ | 148 |  |  |  |  | $ | 145 |  |  | 
|  |  |  | 
                As of 
                 September 30, 2024 |  |  | 
                As of 
                 December 31, 2023 |  | ||||||
| 
                Weighted-average discount rate 
               |  |  |  |  | 9.50% |  |  |  |  |  | 9.50% |  |  | 
| 
                Weighted-average remaining lease term 
               |  |  |  |  | 2.92 |  |  |  |  |  | 3.67 |  |  | 
| 
                Year Ended December 31, 
               |  |  | 
                Amount 
               |  | |||
| 
                2024 (remaining three months) 
               |  |  |  | $ | 31 |  |  | 
| 
                2025 
               |  |  |  |  | 94 |  |  | 
| 
                2026 
               |  |  |  |  | 129 |  |  | 
| 
                2027 
               |  |  |  |  | 88 |  |  | 
| 
                Total lease payments 
               |  |  |  |  | 342 |  |  | 
| 
                Less: imputed interest 
               |  |  |  |  | (43) |  |  | 
| 
                Present value of lease liabilities 
               |  |  |  |  | 299 |  |  | 
| 
                Less: operating lease liabilities, current portion 
               |  |  |  | $ | 92 |  |  | 
| 
                Operating lease liabilities, net of current portion 
               |  |  |  | $ | 207 |  |  | 
|  |  |  | 
                Par Value 
               |  |  | 
                Preferred 
                 Stock Authorized |  |  | 
                Preferred 
                 Stock Issued and Outstanding |  |  | 
                Carrying
                 Value |  |  | 
                Liquidation 
                 Preference |  |  | 
                Common 
                 Stock Issuable Upon Conversion |  | ||||||||||||||||||
| 
                Series A preferred stock 
               |  |  |  | $ | 0.001 |  |  |  |  |  | 9,499,999 |  |  |  |  |  | 9,499,999 |  |  |  |  | $ | 9,327 |  |  |  |  | $ | 9,500 |  |  |  |  |  | 9,499,999 |  |  | 
| 
                Series B preferred stock 
               |  |  |  |  | 0.001 |  |  |  |  |  | 20,223,541 |  |  |  |  |  | 20,055,539 |  |  |  |  |  | 76,176 |  |  |  |  |  | 76,402 |  |  |  |  |  | 20,055,539 |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 29,723,540 |  |  |  |  |  | 29,555,538 |  |  |  |  | $ | 85,503 |  |  |  |  | $ | 85,902 |  |  |  |  |  | 29,555,538 |  |  | 
|  |  |  | 
                For the Nine Months 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| 
                Per share fair value of common stock 
               |  |  |  | $ | 0.62 |  |  |  |  | $ | 0.52 |  |  | 
| 
                Expected volatility 
               |  |  |  |  | 73.8% |  |  |  |  |  | 67.4% |  |  | 
| 
                Expected dividends 
               |  |  |  |  | 0% |  |  |  |  |  | 0% |  |  | 
| 
                Expected term (in years) 
               |  |  |  |  | 5.9 |  |  |  |  |  | 6.1 |  |  | 
| 
                Risk-free rate 
               |  |  |  |  | 3.93% |  |  |  |  |  | 3.56% |  |  | 
|  |  |  | 
                Number of 
                 Options |  |  | 
                Weighted-
                 Average Exercise Price |  |  | 
                Weighted-
                 Average Remaining Contractual Term (In Years) |  |  | 
                Intrinsic 
                 Value (In Thousands) |  | ||||||||||||
| 
                Outstanding as of January 1, 2024 
               |  |  |  |  | 5,509,379 |  |  |  |  | $ | 0.43 |  |  |  |  |  | 7.04 |  |  |  |  | $ | 2,699 |  |  | 
| 
                Granted 
               |  |  |  |  | 25,000 |  |  |  |  |  | 0.92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Exercised 
               |  |  |  |  | (63,750) |  |  |  |  |  | 0.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Forfeited 
               |  |  |  |  | (19,688) |  |  |  |  |  | 0.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Outstanding as of September 30, 2024 
               |  |  |  |  | 5,450,941 |  |  |  |  | $ | 0.44 |  |  |  |  |  | 6.32 |  |  |  |  | $ | 2,644 |  |  | 
| 
                Options exercisable as of September 30, 2024 
               |  |  |  |  | 4,382,734 |  |  |  |  | $ | 0.37 |  |  |  |  |  | 5.97 |  |  |  |  | $ | 2,413 |  |  | 
| 
                Vested and expected to vest as of September 30, 2024 
               |  |  |  |  | 5,450,941 |  |  |  |  | $ | 0.44 |  |  |  |  |  | 6.32 |  |  |  |  | $ | 2,644 |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| 
                Research and development 
               |  |  |  | $ | 86 |  |  |  |  | $ | 84 |  |  | 
| 
                General and administrative 
               |  |  |  |  | 154 |  |  |  |  |  | 145 |  |  | 
| 
                Total stock-based compensation 
               |  |  |  | $ | 240 |  |  |  |  | $ | 229 |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Net loss attributable to common stockholders 
               |  |  |  | $ | (16,690) |  |  |  |  | $ | (12,996) |  |  | 
| Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
                Weighted-average common shares outstanding, basic and diluted 
               |  |  |  |  | 19,192,595 |  |  |  |  |  | 19,134,072 |  |  | 
| 
                Net loss per share attributable to common stockholders, basic and diluted 
               |  |  |  | $ | (0.87) |  |  |  |  | $ | (0.68) |  |  | 
|  |  |  | 
                For the Nine Months Ended 
                 September 30, |  | |||||||||
|  |  |  | 
                2024 
               |  |  | 
                2023 
               |  | ||||||
| 
                Preferred stock (as converted to common stock) 
               |  |  |  |  | 29,555,538 |  |  |  |  |  | 29,555,538 |  |  | 
| 
                Stock options to purchase common stock 
               |  |  |  |  | 5,450,941 |  |  |  |  |  | 5,509,379 |  |  | 
|  |  |  | 
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|  | Exhibits: |  |  |  |  | 
|  | Exhibit A |  |  | Certain Definitions |  | 
|  | Exhibit B-1 |  |  | Form of Company Stockholder Support Agreement |  | 
|  | Exhibit B-2 |  |  | Form of Parent Stockholder Support Agreement |  | 
|  | Exhibit C-1 |  |  | Form of Company Lock-Up Agreement |  | 
|  | Exhibit C-2 |  |  | Form of Parent Lock-Up Agreement |  | 
|  | Exhibit D |  |  | Form of Company Stockholder Written Consent |  | 
|  | Exhibit E |  |  | Form of 2025 Equity Incentive Plan |  | 
|  | Exhibit F |  |  | Form of 2025 Employee Stock Purchase Plan |  | 
|  | Exhibit G |  |  | Form of CSL Asset Purchase Agreement |  | 
|  | Schedules: |  |  |  |  | 
|  | Schedule A |  |  | Company Signatories |  | 
|  | Schedule I |  |  | Exchange Ratio |  | 
|  | Schedule II |  |  | Parent Net Cash |  | 
|  | Schedule 5.6(a) |  |  | Indemnification Agreements |  | 
|  | Schedule 5.11 |  |  | Directors and Officers |  | 
|  | Schedule 5.12(a) |  |  | Investor Agreements |  | 
|  | Schedule 5.12(b) |  |  | Specified Parent Contracts |  | 
| 
                Term 
               |  |  | 
                Section 
               |  | 
| 
                2025 ESPP 
               |  |  | 5.19 |  | 
| 
                2025 Plan 
               |  |  | 5.19 |  | 
| 
                Accounting Firm 
               |  |  | 1.6(e) |  | 
| 
                Agreement 
               |  |  | Preamble |  | 
| 
                Allocation Certificate 
               |  |  | 5.15(a) |  | 
| 
                Anti-Bribery Laws 
               |  |  | 2.23 |  | 
| 
                Anticipated Closing Date 
               |  |  | 1.6(a) |  | 
| 
                Asset Disposition(s) 
               |  |  | 4.7 |  | 
| 
                Certificate of Merger 
               |  |  | 1.3 |  | 
| 
                Certifications 
               |  |  | 3.7(a) |  | 
| 
                Closing 
               |  |  | 1.3 |  | 
| 
                Closing Date 
               |  |  | 1.3 |  | 
| 
                Company 
               |  |  | Preamble |  | 
| 
                Company Benefit Plan 
               |  |  | 2.17(a) |  | 
| 
                Company Board Adverse Recommendation Change 
               |  |  | 5.2(d) |  | 
| 
                Company Board Recommendation 
               |  |  | 5.2(d) |  | 
| 
                Company Budget 
               |  |  | 4.2(b)(v) |  | 
| 
                Company Disclosure Schedule 
               |  |  | Section 2 |  | 
| 
                Company Financials 
               |  |  | 2.7(a) |  | 
| 
                Company In-Licensed IP 
               |  |  | 2.12(b) |  | 
| 
                Company In-bound License 
               |  |  | 2.12(d) |  | 
| 
                Company Lock-Up Agreement 
               |  |  | Recitals |  | 
| 
                Company Lock-Up Signatories 
               |  |  | Recitals |  | 
| 
                Company Material Contract 
               |  |  | 2.13(a) |  | 
| 
                Company Material Contracts 
               |  |  | 2.13(a) |  | 
| 
                Company Out-bound License 
               |  |  | 2.12(d) |  | 
| 
                Company Owned Registered IP 
               |  |  | 2.12(a) |  | 
| 
                Company Permits 
               |  |  | 2.14(b) |  | 
| 
                Company Real Estate Leases 
               |  |  | 2.11 |  | 
| 
                Company Stock Certificate 
               |  |  | 1.7 |  | 
| 
                Company Stockholder Matters 
               |  |  | 5.2(a) |  | 
| 
                Company Stockholder Support Agreement 
               |  |  | Recitals |  | 
| 
                Company Stockholder Written Consent(s) 
               |  |  | Recitals |  | 
| 
                Company Termination Fee 
               |  |  | 9.3(b) |  | 
| 
                Determination Notice 
               |  |  | 5.3(d)(i) |  | 
| 
                Dispute Notice 
               |  |  | 1.6(b) |  | 
| 
                Dissenting Shares 
               |  |  | 1.9(a) |  | 
| 
                D&O Indemnified Parties 
               |  |  | 5.6(a) |  | 
| 
                Drug Regulatory Agency 
               |  |  | 2.14(a) |  | 
| 
                Effective Time 
               |  |  | 1.3 |  | 
| 
                End Date 
               |  |  | 9.1(b) |  | 
| 
                Equity Plan Proposals 
               |  |  | 5.19 |  | 
| 
                Exchange Agent 
               |  |  | 1.8(a) |  | 
| 
                Term 
               |  |  | 
                Section 
               |  | 
| 
                Exchange Fund 
               |  |  | 1.8(a) |  | 
| 
                FDA 
               |  |  | 2.14(a) |  | 
| 
                FDCA 
               |  |  | 2.14(a) |  | 
| 
                Information Statement 
               |  |  | 5.2(a) |  | 
| 
                Intended Tax Treatment 
               |  |  | 5.10(a) |  | 
| 
                Investor Agreements 
               |  |  | 2.22(b) |  | 
| 
                Liability 
               |  |  | 2.9 |  | 
| 
                Merger 
               |  |  | Recitals |  | 
| 
                Merger Sub 
               |  |  | Preamble |  | 
| 
                Nasdaq Listing Application 
               |  |  | 5.9 |  | 
| 
                Net Cash Calculation 
               |  |  | 1.6(a) |  | 
| 
                Net Cash Schedule 
               |  |  | 1.6(a) |  | 
| 
                Parent 
               |  |  | Preamble |  | 
| 
                Parent Benefit Plan 
               |  |  | 3.17(a) |  | 
| 
                Parent Board Adverse Recommendation Change 
               |  |  | 5.3(c) |  | 
| 
                Parent Board Recommendation 
               |  |  | 5.3(c) |  | 
| 
                Parent Designees 
               |  |  | 5.11 |  | 
| 
                Parent Disclosure Schedule 
               |  |  | 3 |  | 
| 
                Parent In-bound License 
               |  |  | 3.12(d) |  | 
| 
                Parent Lock-Up Agreement 
               |  |  | Recitals |  | 
| 
                Parent Material Contract 
               |  |  | 3.13(a) |  | 
| 
                Parent Material Contracts 
               |  |  | 3.13(a) |  | 
| 
                Parent Notice Period 
               |  |  | 5.3(d)(i) |  | 
| 
                Parent Out-bound License 
               |  |  | 3.12(d) |  | 
| 
                Parent Outstanding Shares Certificate 
               |  |  | 5.15(b) |  | 
| 
                Parent Owned Registered IP 
               |  |  | 3.12(a) |  | 
| 
                Parent Permits 
               |  |  | 3.14(b) |  | 
| 
                Parent SEC Documents 
               |  |  | 3.7(a) |  | 
| 
                Parent Share Issuance 
               |  |  | 5.3(a)(ii) |  | 
| 
                Parent Stockholder Matters 
               |  |  | 5.3(a)(viii) |  | 
| 
                Parent Stockholders’ Meeting 
               |  |  | 5.3(a)(viii) |  | 
| 
                Parent Stockholder Support Agreement 
               |  |  | Recitals |  | 
| 
                Parent Termination Fee 
               |  |  | 9.3(c) |  | 
| 
                Pre-Closing Period 
               |  |  | 4.1(a) |  | 
| 
                Regulation M-A Filing 
               |  |  | 2.21 |  | 
| 
                Required Company Stockholder Vote 
               |  |  | 2.4 |  | 
| 
                Required Parent Stockholder Vote 
               |  |  | 3.4 |  | 
| 
                Response Date 
               |  |  | 1.6(b) |  | 
| 
                Sensitive Data 
               |  |  | 2.12(g) |  | 
| 
                Specified Parent Contracts 
               |  |  | 5.12(b) |  | 
| 
                Stockholder Notice 
               |  |  | 5.2(c) |  | 
| 
                Surviving Corporation 
               |  |  | 1.1 |  | 
| 
                Tax Opinion 
               |  |  | 5.1(c) |  | 
| 
                Third Party Expenses 
               |  |  | 9.3(d) |  |