| CUSIP No. 452907108 | |
| (1) Names of reporting persons    Point72 Asset Management, L.P. | |
| (2) Check the appropriate box if a member of a group | (a) | 
| (see instructions) | (b)X | 
| (3) SEC use only | |
| (4) Citizenship or place of organization Delaware | |
| Number of shares beneficially owned by each reporting person with: | |
| (5) Sole voting power                  0 | |
| (6) Shared voting power              0 (see Item 4) | |
| (7) Sole dispositive power           0 | |
| (8) Shared dispositive power       0 (see Item 4) | |
| (9) Aggregate amount beneficially owned by each reporting person 0 (see Item 4) | |
| (10) Check if the aggregate amount in Row (9) excludes certain shares (see instructions) | |
| (11) Percent of class represented by amount in Row (9) 0% (see Item 4) | |
| (12) Type of reporting person (see instructions) PN | |
| CUSIP No. 452907108 | |
| (1) Names of reporting persons    Point72 Capital Advisors, Inc. | |
| (2) Check the appropriate box if a member of a group | (a) | 
| (see instructions) | (b)X | 
| (3) SEC use only | |
| (4) Citizenship or place of organization Delaware | |
| Number of shares beneficially owned by each reporting person with: | |
| (5) Sole voting power                  0 | |
| (6) Shared voting power              0 (see Item 4) | |
| (7) Sole dispositive power           0 | |
| (8) Shared dispositive power       0 (see Item 4) | |
| (9) Aggregate amount beneficially owned by each reporting person 0 (see Item 4) | |
| (10) Check if the aggregate amount in Row (9) excludes certain shares (see instructions) | |
| (11) Percent of class represented by amount in Row (9) 0% (see Item 4) | |
| (12) Type of reporting person (see instructions)  CO | |
| CUSIP No. 452907108 | |
| (1) Names of reporting persons    Cubist Systematic Strategies, LLC | |
| (2) Check the appropriate box if a member of a group | (a) | 
| (see instructions) | (b)X | 
| (3) SEC use only | |
| (4) Citizenship or place of organization Delaware | |
| Number of shares beneficially owned by each reporting person with: | |
| (5) Sole voting power                  0 | |
| (6) Shared voting power              0 (see Item 4) | |
| (7) Sole dispositive power           0 | |
| (8) Shared dispositive power       0 (see Item 4) | |
| (9) Aggregate amount beneficially owned by each reporting person 0 (see Item 4) | |
| (10) Check if the aggregate amount in Row (9) excludes certain shares (see instructions) | |
| (11) Percent of class represented by amount in Row (9) 0% (see Item 4) | |
| (12) Type of reporting person (see instructions) OO | |
| CUSIP No. 452907108 | |
| (1) Names of reporting persons    Steven A. Cohen | |
| (2) Check the appropriate box if a member of a group | (a) | 
| (see instructions) | (b)X | 
| (3) SEC use only | |
| (4) Citizenship or place of organization United States | |
| Number of shares beneficially owned by each reporting person with: | |
| (5) Sole voting power                  0 | |
| (6) Shared voting power              0 (see Item 4) | |
| (7) Sole dispositive power           0 | |
| (8) Shared dispositive power       0 (see Item 4) | |
| (9) Aggregate amount beneficially owned by each reporting person 0 (see Item 4) | |
| (10) Check if the aggregate amount in Row (9) excludes certain shares (see instructions) | |
| (11) Percent of class represented by amount in Row (9) 0% (see Item 4) | |
| (12) Type of reporting person (see instructions) IN | |