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                CALCULATION OF REGISTRATION FEE
               
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                Title of Each Class of Securities Offered 
               
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                Amount to be 
                 
            Registered  | 
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                Maximum 
                 
            Offering Price Per Unit  | 
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                Maximum 
                 
            Aggregate Offering Price  | 
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                Amount of 
                 
            Registration Fee(1)  | 
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                Common Stock, $0.001 par value per share 
               
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             |  |  |  | 3,072,038 |  |  |  |  | $ | 81.10 |  |  |  |  | $ | 249,142,281.80 |  |  |  |  | $ | 23,095.49 |  |  | 
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                Per Share 
               
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                Total 
               
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                Registered direct offering price 
               
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             |  |  | $ | 81.10 |  |  |  |  | $ | 249,142,282 |  |  | 
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                Proceeds, before expenses, to us 
               
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             |  |  | $ | 81.10 |  |  |  |  | $ | 249,142,282 |  |  | 
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                Page 
               
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|  |  |  |  | S-ii |  |  | |
|  |  |  |  | S-iv |  |  | |
|  |  |  |  | S-1 |  |  | |
|  |  |  |  | S-8 |  |  | |
|  |  |  |  | S-10 |  |  | |
|  |  |  |  | S-11 |  |  | |
|  |  |  |  | S-15 |  |  | |
|  |  |  |  | S-16 |  |  | |
|  |  |  |  | S-17 |  |  | |
|  |  |  |  | S-18 |  |  | |
|  |  |  |  | S-20 |  |  | |
|  |  |  |  | S-20 |  |  | |
|  |  |  |  | S-20 |  |  | |
|  |  |  |  | S-21 |  |  | |
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                Page 
               
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                Registered direct offering price per share 
               
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             |  |  |  |  |  |  |  |  | $ | 81.10 |  |  | 
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                Historical net tangible book value per share as of September 30, 2021 
               
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             |  |  | $ | 6.40 |  |  |  |  |  |  |  |  | 
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                Increase in net tangible book value per share attributable to this placement 
               
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             |  |  | $ | 4.65 |  |  |  |  |  |  |  |  | 
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                As adjusted net tangible book value per share after this placement 
               
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             |  |  |  |  |  |  |  |  | $ | 11.04 |  |  | 
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                Dilution per share to new investors participating in this placement 
               
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             |  |  |  |  |  |  |  |  | $ | 70.06 |  |  | 
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|  |  |  |  |  | 24 |  |  |