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Stockholders' Equity And Stock-Based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2022
Stockholders’ Equity and Stock-Based Compensation Expense |
Stock Options And Unvested Performance Award Outstanding Activity |
|  | Stock Options |  |  | Performance Awards
Outstanding as of December 31, 2021 |  | 2,663,727 |  |  | 138,055
Options granted |  | 4,000 |  |  | —
Options exercised |  | (194,264) |  |  | —
Options forfeited/canceled |  | (22,139) |  |  | (130,913)
Outstanding as of September 30, 2022 |  | 2,451,324 |  |  | 7,142
Stock-Based Compensation Expense |
|  | Three months ended |  | Nine months ended |
|  | September 30, |  | September 30, |
|  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Research and development |  | $ | 399 |  | $ | 452 |  | $ | 1,234 |  | $ | 867 |
General and administrative |  |  | 71 |  |  | 120 |  |  | 216 |  |  | 370 |
Total stock-based compensation expense |  | $ | 470 |  | $ | 572 |  | $ | 1,450 |  | $ | 1,237 |

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