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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity | The activity for the Company’s 2024 Plan, 2014 Plan, and 2015 Plan, for the six months ended June 30, 2024, is summarized as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value ($000) |
Outstanding — December 31, 2023 |  |  | 1,867,795 |  |  | $ | 10.72 |  |  |  | 6.10 |  |  | $ | 184 |
Granted |  |  | 1,000,060 |  |  | $ | 1.86 |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | (25,047 | ) |  | $ | 36.36 |  |  |  |  |  |  |
Outstanding — June 30, 2024 |  |  | 2,842,808 |  |  | $ | 7.38 |  |  |  | 7.04 |  |  | $ | 254 |
Exercisable — June 30, 2024 |  |  | 1,545,764 |  |  | $ | 11.78 |  |  |  | 5.22 |  |  | $ | 59 |
Vested or expected to vest — June 30, 2024 |  |  | 2,842,808 |  |  | $ | 7.38 |  |  |  | 7.04 |  |  | $ | 254 |
Schedule of Restricted Stock Units ("RSU") Activity | Restricted stock unit (“RSU”) activity under the 2024 Plan, 2014 Plan, and 2015 Plan for the six months ended June 30, 2024, is summarized as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Non-vested at December 31, 2023 |  |  | 1,886,374 |  |  | $ | 2.28 |
Granted |  |  | 2,015,940 |  |  | $ | 1.88 |
Vested |  |  | (629,849 | ) |  | $ | 3.00 |
Forfeited |  |  | (9,120 | ) |  | $ | 2.15 |
Non-vested at June 30, 2024 |  |  | 3,263,345 |  |  | $ | 1.89 |
Stock-Based Compensation Expense Related to Stock Options | Stock-based compensation expense related to stock options 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, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Research and development |  | $ | 216 |  |  | $ | 301 |  |  | $ | 411 |  |  | $ | 675 |
Selling, general and administrative |  |  | 543 |  |  |  | 427 |  |  |  | 1,053 |  |  |  | 760 |
Total |  | $ | 759 |  |  | $ | 728 |  |  | $ | 1,464 |  |  | $ | 1,435 |

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