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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 2021 Equity Incentive Plan In March 2021, the Company adopted the 2021 Equity Incentive Plan (the “2021 Plan”), which became effective in connection with the Company's initial public offering (“IPO”). The 2021 Plan was approved by the Board of Directors and stockholders in March 2021. The 2021 Plan is an equity incentive plan pursuant to which the Company may grant the following awards: (i) incentive stock options; (ii) nonstatutory stock options; (iii) stock appreciation rights; (iv) restricted stock awards; (v) restricted stock unit awards; (vi) performance awards; and (vii) other forms of stock awards to employees, directors, and consultants, including employees and consultants of the Company’s affiliates. The 2021 Plan is a successor to the Company’s 2018 Stock Incentive Plan (the “2018 Plan”). Following the effectiveness of the 2021 Plan, no further grants may be made under the 2018 Plan; however, any outstanding equity awards granted under the 2018 Plan will continue to be governed by the terms of the 2018 Plan. As of June 30, 2024, 334,014 shares of common stock remained available for issuance under the 2021 Plan. As of June 30, 2024, the total number of shares authorized for issuance under the 2021 Plan was 642,722 shares. The following table sets forth stock-based compensation included in the Company’s statement of operations and comprehensive loss (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Research and development expense | $ | 534 |  |  | $ | 273 |  |  | $ | 1,081 |  |  | $ | 432 |
General and administrative expense | 3,639 |  |  | 4,140 |  |  | 7,607 |  |  | 8,511 |
Total stock-based compensation expense | $ | 4,173 |  |  | $ | 4,413 |  |  | $ | 8,688 |  |  | $ | 8,943 |
As of June 30, 2024, there was $16.5 million of total unrecognized compensation cost related to unvested stock options granted under the 2018 Plan and 2021 Plan, which is expected to be recognized over a weighted average period of 1.3 years. Employee Stock Purchase Plan In March 2021, the Company adopted the Employee Stock Purchase Plan (the “ESPP”), which became effective in connection with the IPO. The ESPP was adopted by the Board of Directors and stockholders in March 2021, but the Company has not yet commenced offerings to employees under the ESPP. The ESPP initially provides participating employees with the opportunity to purchase up to an aggregate of 61,850 shares of common stock. The number of shares reserved under the ESPP automatically increases on January 1 of each year through and until January 1, 2031, in an amount equal to the lesser of (i) 1% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, and (ii) 123,700 shares; provided, however, that before the date of any such increase, the Board of Directors may determine that such increase will be less than the amount set forth in clauses (i) and (ii).

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