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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Employee Stock Purchase Plan In May 2017, the Company’s stockholders approved the 2016 Employee Stock Purchase Plan (the 2016 ESPP). The 2016 ESPP is structured as a qualified employee stock purchase plan under Section 423 of the Internal Revenue Code of 1986, as amended (IRC), and is not subject to the provisions of the Employee Retirement Income Security Act of 1974. The Company reserved 800,000 shares of common stock for issuance under the 2016 ESPP. The 2016 ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. The 2016 ESPP provides for six-month offering periods ending on May 31 and November 30 of each year. At the end of each offering period, employees are able to purchase shares at 85% of the fair market value of the Company’s common stock on the last day of the offering period. During the nine months ended September 30, 2024, 44,129 shares of common stock were purchased under the 2016 ESPP. Employee Stock Incentive Plans In October 2013, the Company implemented the 2013 Equity Incentive Plan (2013 Plan). In May 2023, the 2013 Plan was terminated, and no further awards may be issued under the plan. If an option granted under the 2013 Plan expires or terminates for any reason without having been fully exercised, if any shares of restricted stock are forfeited, or if any award terminates, expires or is settled without all or a portion of the shares of common stock covered by the award being issued, such shares will become available for issuance under the 2023 Equity Incentive Plan (2023 Plan). The 2023 Plan was effective as of stockholder approval in May 2023. The 2023 Plan provides for grants of stock options and other stock-based awards, as well as cash-based performance awards. The 2023 Plan authorized the issuance of up to an aggregate of 4,850,000 shares of common stock. In May 2024, the board and stockholders of the Company approved an amendment to the 2023 Plan to increase the number of shares of common stock available for issuance thereunder by 2,000,000 shares. Accordingly, the maximum number of shares of common stock authorized for issuance under the 2023 Plan has been increased to 6,850,000 shares. If an option expires or terminates for any reason without having been fully exercised, if any shares of restricted stock are forfeited, or if any award terminates, expires or is settled without all or a portion of the shares of common stock covered by the award being issued, such shares are available for the grant of additional awards. However, any shares that are withheld (or delivered) to pay withholding taxes or to pay the exercise price of an option are not available for the grant of additional awards. The following stock-based compensation expense was recognized for the periods indicated (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Research and development | $ | 2,940 |  |  | $ | 2,335 |  |  | $ | 9,033 |  |  | $ | 6,996 |
Selling, general and administrative | 3,030 |  |  | 2,455 |  |  | 9,141 |  |  | 7,018 |
Total stock-based compensation expense | $ | 5,970 |  |  | $ | 4,790 |  |  | $ | 18,174 |  |  | $ | 14,014 |
Employee stock options The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model using the assumptions in the following table for options issued during the period indicated:
| Nine Months Ended September 30,
| 2024 |  | 2023
Expected dividend yield | 0% |  | 0%
Expected volatility | 94.9% -115.7% |  | 76.1% - 94.9%
Risk-free interest rate | 3.5% - 4.7% |  | 3.5% - 4.4%
Expected term | 6.06 years |  | 5.88 years
The following table summarizes stock option activity during the nine months ended September 30, 2024:
| Shares |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2023 | 12,223,637 |  |  | $ | 15.11 |  |  | 6.7 |  |
Granted | 1,950,032 |  |  | 16.18 |  |  |  |  |
Exercised | (331,916) |  |  | 9.41 |  |  |  |  |
Forfeited | (141,409) |  |  | 11.64 |  |  |  |  |
Expired | (259,817) |  |  | 22.09 |  |  |  |  |
Outstanding, September 30, 2024 | 13,440,527 |  |  | $ | 15.30 |  |  | 6.4 |  | $ | 18 |
As of September 30, 2024: |  |  |  |  |  |  |
Exercisable | 8,970,940 |  |  | $ | 17.66 |  |  | 5.4 |  | $ | 10 |
Vested and expected to vest | 12,435,275 |  |  | $ | 15.70 |  |  | 6.3 |  | $ | 16 |
As of September 30, 2024, the total unrecognized compensation expense related to unvested stock options, net of related forfeiture estimates, was approximately $26.3 million, which the Company expects to recognize over a weighted-average period of approximately 1.4 years. The following table summarizes additional information on stock options (in thousands, except per share amounts):
|  |  | Nine Months Ended September 30,
|  |  |  |  | 2024 |  | 2023
Weighted-average fair value per share of stock options granted |  |  |  |  | $ | 12.79 |  |  | $ | 3.78 |
Total intrinsic value of stock options exercised |  |  |  |  | $ | 2,616 |  |  | $ | 61 |
Total cash received for stock options exercised |  |  |  |  | $ | 3,122 |  |  | $ | 87 |
Total grant date fair value of stock options vested |  |  |  |  | $ | 13,533 |  |  | $ | 13,611 |
Restricted Stock Units Restricted stock units (RSUs) are valued based on the closing price of the Company’s common stock on the date of the grant. The fair value of RSUs is recognized and amortized on a straight-line basis over the requisite service period of the award. The following table summarizes RSU activity during the nine months ended September 30, 2024:
| Shares |  | Weighted-Average Grant Date Fair Value
Outstanding, December 31, 2023 | 905,614 |  |  | $ | 5.97 |
Granted | 649,715 |  |  | 17.04 |
Vested | (477,681) |  |  | 6.90 |
Forfeited | (27,904) |  |  | 13.07 |
Outstanding, September 30, 2024 | 1,049,744 |  |  | $ | 12.21 |
At September 30, 2024, there was $8.2 million of total unrecognized compensation cost related to unvested RSUs, which the Company expects to recognize over a remaining weighted-average period of approximately 1.5 years.

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