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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2024
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation | 13. Stock-based Compensation Under the Company’s 2015 New Employee Incentive Plan, as amended (the “2015 Plan”), awards may only be granted to employees who were not previously an employee or director of the Company, or following a bona fide period of non-employment, as a material inducement to entering into employment with the Company. On June 6, 2024, the Company’s Board increased the number of shares for future issuances under the 2015 Plan by 75,000 shares of common stock. As of June 30, 2024, there were 62,908 shares of common stock remaining and available for future issuances under the 2015 Plan. The Company’s 2020 Stock Incentive Plan, as amended (the “2020 Plan”), which replaced the Company’s 2014 Equity Incentive Plan, provides for the award or sale of shares of common stock (including restricted stock), the award of stock units and stock appreciation rights, and the grant of both incentive stock options to purchase common stock to directors, officers, employees and consultants of the Company. The 2020 Plan provides for the issuance of up to 236,667 shares of common stock, plus the number of shares available for issuance is increased to the extent that awards granted under the 2020 Plan and the Company’s 2014 Equity Incentive Plan are forfeited or expire (except as otherwise provided in the 2020 Plan). As of June 30, 2024, there were 1,899 shares remaining and available for future issuances under the 2020 Plan. Generally, options issued under the 2020 Plan are subject to a two-year or four-year vesting schedule with 25% of the options vesting on the one year anniversary of the grant date followed by equal monthly installment vesting, and have a contractual term of 10 years. A summary of activity for the six months ended June 30, 2024 is as follows:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Balance as of December 31, 2023 |  |  | 140,109 |  |  | $ | 37.48 |  |  |  | 8.07 |  |  |  |
Granted |  |  | 196,824 |  |  | $ | 2.09 |  |  |  |  |  |  |
Cancelled/expired |  |  | (5 | ) |  | $ | 271,125 |  |  |  |  |  |  |
Balance as of June 30, 2024 |  |  | 336,928 |  |  | $ | 12.78 |  |  |  | 8.81 |  |  | $ | 3,000 |
Vested and expected to vest at June 30, 2024 |  |  | 310,675 |  |  | $ | 13.52 |  |  |  | 8.75 |  |  | $ | 3,000 |
Exercisable at June 30, 2024 |  |  | 103,834 |  |  | $ | 32.39 |  |  |  | 7.45 |  |  | $ | — |
As of June 30, 2024, the total compensation cost related to non-vested stock options not yet recognized for all the Company’s plans is approximately $0.7 million, which is expected to be recognized as a result of vesting under service conditions over a weighted average period of 2.3 years.

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