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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Total compensation cost recognized for all stock-based compensation awards in the condensed consolidated statements of operations was as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Research and development | $ | 2,571 |  |  | $ | 3,045 |  |  | $ | 7,182 |  |  | $ | 9,803 |
General and administrative | 2,160 |  |  | 2,836 |  |  | 7,271 |  |  | 14,127 |
Total stock-based compensation expense | $ | 4,731 |  |  | $ | 5,881 |  |  | $ | 14,453 |  |  | $ | 23,930 |
Schedule of Changes in Unvested Restricted Stock | The following is a summary of restricted stock unit awards activity for the nine months ended September 30, 2023:
| Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested restricted stock unit awards as of December 31, 2022 | 1,499,070 |  | $ | 18.70 |
Issued | 1,331,578 |  | $ | 8.71 |
Vested | (262,588) |  | $ | 19.87 |
Forfeited | (462,777) |  | $ | 18.86 |
Unvested restricted stock unit awards as of September 30, 2023 | 2,105,283 |  | $ | 12.20 |
Schedule of Stock Option Activity | The following is a summary of stock option activity for the nine months ended September 30, 2023:
| Shares |  | Weighted Average Exercise Price |  | Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2022 | 5,276,148 |  | $ | 23.99 |  |  | 8.00 |  | $ | 402 |
Granted | 2,195,300 |  |  | $ | 8.74 |  |  |  |  |
Exercised | (3,122) |  |  | $ | 3.38 |  |  |  |  |
Cancelled | (1,467,700) |  |  | $ | 30.95 |  |  |  |  |
Outstanding at September 30, 2023 | 6,000,626 |  | $ | 16.72 |  |  | 7.83 |  | $ | 342 |
Exercisable at September 30, 2023 | 2,449,032 |  | $ | 22.72 |  |  | 6.34 |  | $ | 279 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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