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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Stock-based compensation |  |  |
Vesting of early exercised options (in shares) | 4,670 |  | 14,745
Unvested early exercises of stock options | $ 100 |  | $ 100
Future awards under the 2021 Employee Stock Purchase Plan |  |  |
Stock-based compensation |  |  |
Stock authorized for issuance (in shares) | 1,153,675 |  | 839,539
Exercise of outstanding stock options |  |  |
Stock-based compensation |  |  |
Weighted-average grant-date fair value of stock options granted (in dollars per share) | $ 9.66 | $ 9.19 |
Unrecognized compensation cost | $ 17,200 |  |
Unrecognized compensation cost, weighted-average period for recognition | 2 years 10 days |  |
Vesting of outstanding restricted stock units |  |  |
Stock-based compensation |  |  |
Unrecognized compensation cost | $ 24,900 |  |
Unrecognized compensation cost, weighted-average period for recognition | 2 years 11 months 15 days |  |
Performance Shares (PSUs) |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 438,500 |  |
Granted (in dollars per share) | $ 14.86 |  |
Outstanding (in shares) | 438,500 |  |
Vested (in shares) | 0 |  |
Stock-based compensation expense | $ 0 |  |
Future awards under the 2021 Stock Option and Incentive Plan |  |  |
Stock-based compensation |  |  |
Stock authorized for issuance (in shares) | 7,339,182 |  | 6,336,068
2016 Stock Plan |  |  |
Stock-based compensation |  |  |
Stock authorized for issuance (in shares) | 1,813,811 |  | 2,044,585

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