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Stock-based compensation | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-based compensation | Stock-based compensation Stock-based compensation expense for the three and six months ended June 30, 2024 and 2023 was classified in the Company’s condensed consolidated statement of operations and comprehensive loss as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation expense: |  |  |  |  |  |  |
Research and development | $ | 2,465 |  |  | $ | 2,644 |  |  | $ | 4,702 |  |  | $ | 5,227 |
General and administrative | 3,916 |  |  | 3,781 |  |  | 7,894 |  |  | 7,449 |
Total stock-based compensation expense | $ | 6,381 |  |  | $ | 6,425 |  |  | $ | 12,596 |  |  | $ | 12,676 |
Stock options During the six months ended June 30, 2024, the Company granted stock options for the purchase of 3,055,807 shares of common stock with a weighted average exercise price of $6.95 per share and a weighted average grant-date fair value of $5.70 per shares. As of June 30, 2024, the unrecognized compensation cost related to outstanding stock options was $50.1 million, which is expected to be recognized over a weighted-average period of 2.4 years. On March 7, 2024, the Company approved an option repricing program applicable to outstanding option awards granted to current employees of the Company under the Company’s 2020 Stock Option and Incentive Plan, or the 2020 Plan, with an exercise price per share greater than or equal to $22.00. The repriced awards have new exercise prices of $11.88 per share for awards held by employees generally and $19.00 per share for awards held by members of the Company's senior leadership team. To receive the benefit of this reduced exercise price, holders of repriced option awards must not, prior to March 7, 2025, (i) voluntarily leave employment with the Company or (ii) exercise the repriced options. The repriced options otherwise remain on their existing terms and conditions as set forth in the 2020 Plan and applicable award agreements. During the three and six months ended June 30, 2024, the Company recorded an incremental non-cash charge of $0.4 million and $0.5 million related to this option repricing. Performance-based restricted stock units During the six months ended June 30, 2024, the Company did not grant any performance-based restricted stock units, or PSUs. In addition, no PSUs vested during the six months ended June 30, 2024 upon their respective achievement of performance-based vesting criteria. Upon vesting, each PSU automatically converts into one share of the Company’s common stock. As of June 30, 2024, the unrecognized compensation cost related to outstanding PSUs with performance-based vesting criteria that are considered not probable of achievement was $3.0 million. Time-based restricted stock units During the six months ended June 30, 2024, the Company issued 1,013,350 restricted stock units, or RSUs, that were subject to time-based vesting conditions to its employees. These RSUs are valued on the grant date using the grant date market price of the underlying shares. A total of 136,837 RSUs vested during the six months ended June 30, 2024 upon their respective vesting schedules. Upon vesting, each RSU automatically converts into one share of the Company’s common stock. The Company indirectly repurchased 15,321 shares of its common stock through net-share settlement as consideration for employee tax withholding obligations arising upon vesting of the RSUs, which tax amounts were remitted to the applicable revenue authorities by the Company in cash on behalf of the RSU holders. As of June 30, 2024, the unrecognized compensation cost related to outstanding RSUs was $9.7 million, which is expected to be recognized over a weighted-average period of 3.3 years.

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