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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement, Disclosure [Abstract] |
Stock-Based Compensation | Stock-Based Compensation In November 2014, the Board of Directors of the Company (“the Board”), and in April 2015, the Company’s stockholders, approved the Company’s 2014 Equity Incentive Plan (the “2014 Plan”), which became effective in April 2015. The 2014 Plan provides for the grant of stock options, other forms of equity compensation, and performance cash awards. In June 2021, the Company's stockholders approved an Amended and Restated 2014 Equity Incentive Plan (the “A&R 2014 Plan”), following its adoption by the Board in April 2021, which, among other things, added 4,900,000 shares to the maximum number of shares of common stock to be issued under the plan and extended the annual automatic increases (discussed further below) until January 1, 2031 and eliminated individual grant limits that applied under the 2014 Plan to awards that were intended to comply with the exemption for “performance-based compensation” under Code Section 162(m). The maximum number of shares of common stock that may be issued under the A&R 2014 Plan was 14,353,902 as of June 30, 2026. The number of shares of common stock reserved for issuance under the A&R 2014 Plan automatically increases on January 1 of each year, beginning on January 1, 2016, and ending on and including January 1, 2031, by 4% of the total number of shares of the Company’s capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the Board. Pursuant to the terms of the A&R 2014 Plan, on January 1, 2026, the common stock reserved for issuance under the A&R 2014 Plan automatically increased by 2,274,191 shares. During the three and six months ended June 30, 2026, 22,975 and 999,793 stock options were exercised, respectively. During the three and six months ended June 30, 2025, 186,480 and 1,075,505 stock options were exercised, respectively. In June 2021, the Company's stockholders approved an Employee Stock Purchase Plan (the “ESPP”), following its adoption by the Board in April 2021. The maximum number of shares of common stock that may be issued under the ESPP is 1,500,000. The first offering period under the ESPP began on October 1, 2021, and the first purchase date occurred on May 31, 2022. As of June 30, 2026, 574,770 shares have been issued under the ESPP. In January 2023, the Board approved the 2023 Employment Inducement Award Plan (as amended, the “2023 Plan”) to make equity awards to newly hired employees as a material inducement to employment in accordance with Nasdaq Rule 5635(c)(4). The maximum number of shares of common stock that may be issued under the 2023 Plan was 4,500,000 as of June 30, 2026. In February 2025, the Board approved the Tenth Amended and Restated Non-Employee Director Compensation Policy (the “Non-Employee Director Compensation Policy”). The equity compensation granted pursuant to the Non-Employee Director Compensation Policy is granted under the A&R 2014 Plan. Stock-based compensation expense recorded under the A&R 2014 Plan, ESPP and 2023 Plan is included in the following line items in the accompanying unaudited condensed consolidated statements of operations (in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2026 |  | 2025 |  | 2026 |  | 2025
Research and development |  | $ | 229 |  |  | $ | 114 |  |  | $ | 449 |  |  | $ | 471 |
Selling, general and administrative |  | 2,740 |  |  | 2,350 |  |  | 5,625 |  |  | 5,108 |
Total stock-based compensation expense |  | $ | 2,969 |  |  | $ | 2,464 |  |  | $ | 6,074 |  |  | $ | 5,579 |
There was no stock-based compensation expense related to performance-based awards recognized during the three and six months ended June 30, 2026, and 2025, as the probability criteria was not met.

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