Stock-based compensation |
8. | Stock-based compensation |
The 2023 Stock Option and Incentive Plan (2023 Plan), was adopted by the board of directors, approved by the Company’s stockholders on July 4, 2023, and became effective on July 13, 2023, replacing a prior share-based incentive plan. The number of shares initially reserved for issuance under the 2023 Plan was initially 2,585,968, which automatically increased by 855,016 shares on January 1, 2024 and will increase each January 1 thereafter, by (i) 4% of the outstanding number of shares of our Series A common stock on the immediately preceding December 31 or (ii) a lesser number of shares as determined by the compensation committee of the board of directors. As such, as of June 30, 2024, the maximum number of shares with respect to which awards may be issued under the 2023 Plan was 3,440,984, and 1,957,700 shares were available for future grant thereunder. The Company also established a pool of 1.0 million shares of Series A common stock from which grants of stock-based compensation awards may be issued as inducement for new employees to accept employment offers from the Company from time to time. Inducement grants are granted outside of the 2023 Plan and do not require approval from the Company’s stockholders pursuant to the Nasdaq inducement grant exception in accordance with Nasdaq Listing Rule 5635(c)(4). During the six months ended June 30, 2024, the Company granted 643,548 option awards from this pool. The Company has recorded aggregate stock-based compensation expense related to the issuance of stock option awards to employees and non-employees in the unaudited condensed statements of operations and comprehensive loss as follows (in thousands): | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2024 | | 2023 | | 2024 | | 2023 | Stock options | | $ | 1,138 | | $ | 1,057 | | $ | 1,587 | | $ | 1,824 | Restricted stock units | | | 311 | | | — | | | 621 | | | — | Total stock-based compensation expense | | $ | 1,449 | | $ | 1,057 | | $ | 2,208 | | $ | 1,824 | Included in: | | | | | | | | | | | | | General and administrative expense | | $ | 1,181 | | $ | 856 | | $ | 1,694 | | $ | 1,454 | Research and development expense | | | 268 | | | 201 | | | 514 | | | 370 | Total stock-based compensation expense | | $ | 1,449 | | $ | 1,057 | | $ | 2,208 | | $ | 1,824 |
Stock options The Company’s stock options consist of (i) time-based options, which vest and become exercisable, subject to the participant’s continued employment or service through the applicable vesting date and (ii) performance-based options, which vest based on performance measures against predetermined objectives that could include successful completion of qualified equity offerings or announced topline results for clinical trials and positive clinical results over a specified performance period. The Company’s time-based options granted have various vesting schedules that may range from vesting immediately to vesting over four years. The following table summarizes stock option activity (in thousands, except share and per share data): | | | | | | | | | | | | | | | | | | Weighted- | | | | | | Number of | | | | | Average | | | | | | Shares | | Weighted- | | Remaining | | | | | | Underlying | | Average | | Contractual | | Aggregate | | | Outstanding | | Exercise | | Term | | Intrinsic | | | Options | | Price | | (in Years) | | Value | Outstanding, January 1, 2024 | | 3,753,507 | | $ | 7.99 | | 7.1 | | $ | 8 | Options granted | | 1,147,506 | | | 4.62 | | | | | | Options exercised | | (17,995) | | | 6.36 | | | | | | Options forfeited/expired | | (418,951) | | | 10.20 | | | | | | Outstanding, June 30, 2024 (a) | | 4,464,067 | | $ | 6.92 | | 7.2 | | $ | — | Vested and exercisable as of June 30, 2024 | | 2,462,232 | | $ | 7.19 | | 5.7 | | $ | — |
____________ | (a) | Includes 619,742 performance-based options with a weighted-average exercise price of $6.38, almost all of which were fully vested and exercisable. |
During the six months ended June 30, 2024 and 2023, the weighted average grant-date fair value per share of stock options granted was $3.58 and $10.28, respectively, and the total intrinsic value of stock options exercised was $0.1 million and nil, respectively. Additionally, during the six months ended June 30, 2024 and 2023, cash received from the exercise of options was $0.1 million and nil, respectively. As of June 30, 2024, there was $10.3 million of total unrecognized compensation cost related to stock options, which is expected to be recognized over a remaining weighted-average period of 2.6 years. Restricted stock units The Company’s restricted stock units generally vest over a four-year period in equal amounts on an annual basis, provided the employee remains continuously employed with the Company. The fair value of the restricted stock units is equal to the closing price of the Company’s Series A common stock on the grant date. The following table summarizes restricted stock unit activity: | | | | | | | | | | Weighted-Average | | | Restricted | | Grant Date | | | Stock Units | | Fair Value | Outstanding, January 1, 2024 | | 1,132,410 | | $ | 2.96 | Granted | | 49,330 | | | 5.23 | Forfeited/expired | | (55,900) | | | 4.96 | Outstanding, June 30, 2024 | | 1,125,840 | | $ | 2.96 |
As of June 30, 2024 the total unrecognized compensation expense related to unvested restricted stock units was $2.6 million, which is expected to be recognized over a remaining weighted-average period of 3.0 years. Valuation assumptions The fair value of each stock option granted was estimated on the date of grant using the Black-Scholes option pricing model using the following assumptions: | | | | | | | | | Six Months Ended June 30, | | Six Months Ended June 30, | | | 2024 | | 2023 | Expected volatility | | 92 - 96 | % | | 89 - 91 | % | Risk-free interest rate | | 4.1 - 4.5 | % | | 3.6 | % | Dividend yield | | — | | | — | | Expected term (in years) | | 5.3 - 6.1 | | | 5.0 - 7.0 | |
The expected term of the stock options represents the average of the contractual term of the options and the weighted-average expected vesting period. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility rate was based on the historical volatilities of comparable companies in the Company’s industry. The Company has never declared or paid any cash dividends and does not presently plan to pay cash dividends in the foreseeable future. Consequently, the Company used an expected dividend yield of zero. Employee stock purchase plan The 2023 Employee Stock Purchase Plan (the ESPP), was adopted by the board of directors with an initial total of 215,497 shares of Series A common stock reserved for issuance under this plan, which automatically increased on January 1, 2024 and will increase each January 1 thereafter through January 1, 2033, by the least of (i) 215,497 shares of Series A common stock, (ii) 1% of the outstanding number of shares of the Company’s Series A common stock on the immediately preceding December 31 or (iii) such lesser number of shares of Series A common stock as determined by the administrator of the ESPP. On January 1, 2024 and in accordance with the ESPP, the authorized shares were increased by 213,754 shares for a total of 429,251 shares of Series A common stock available under the ESPP. No shares of Series A common stock have been issued under the ESPP to date; the first offering period under the ESPP is expected to commence in the third quarter of 2024.
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