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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-based compensation expense |  |  |  |
Total stock-based compensation expense | $ 4,157 | $ 582 | $ 11,286 | $ 736
Research and development |  |  |  |
Stock-based compensation expense |  |  |  |
Total stock-based compensation expense | 2,405 | 392 | 6,427 | 495
General and administrative |  |  |  |
Stock-based compensation expense |  |  |  |
Total stock-based compensation expense | $ 1,752 | $ 190 | $ 4,859 | $ 241

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