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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 10. Stock-Based Compensation In January 2024, the number of shares of common stock available for issuance under the Company’s 2015 Omnibus Incentive Plan, or the 2015 Plan, was increased by 3,393,065 shares of common stock due to the automatic annual provision to increase shares of common stock available under the 2015 Plan. Additionally in December 2023, the Company’s board of directors approved an increase of 1,100,000 shares of common stock available for issuance under the Company’s 2023 Inducement Plan, or Inducement Plan. As of March 31, 2024, there were 3,417,671 shares of common stock of available for issuance under the 2015 Plan and 1,071,950 shares of common stock available for issuance under the Inducement Plan. The Company recognized stock-based compensation expense related to the issuance of stock option awards and restricted stock units to employees and non-employees and related to the Company’s 2015 Employee Stock Purchase Plan, or ESPP, in the condensed consolidated statements of comprehensive loss as follows:
| Three Months Ended March 31, |
| 2024 |  |  | 2023 |
Research and development | $ | 4,144 |  |  | $ | 2,778 |
Selling, general and administrative |  | 4,755 |  |  |  | 3,460 |
Total | $ | 8,899 |  |  | $ | 6,238 |
Compensation expense by type of award in the three months ended March 31, 2024 and 2023 was as follows:
| Three Months Ended March 31, |
| 2024 |  |  | 2023 |
Stock options | $ | 7,157 |  |  | $ | 5,393 |
RSUs |  | 1,645 |  |  |  | 781 |
ESPP |  | 97 |  |  |  | 64 |
Total | $ | 8,899 |  |  | $ | 6,238 |
As of March 31, 2024, there were $105.0 million of unrecognized compensation costs related to employee and non-employee unvested stock options and RSUs granted under the 2015 Plan and the Company’s 2007 Stock Plan, which are expected to be recognized over a weighted-average remaining service period of 2.8 years.

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