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Equity Incentive Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) | 5,734,044 |  | 5,734,044 |
Total stock-based compensation | $ 6,786 | $ 1,177 | $ 19,256 | $ 2,564
Class A common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) | 8,302,701 |  | 8,302,701 |
Class A common stock | Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) | 1,195,327 |  | 1,195,327 |
Total stock-based compensation | $ 100 |  |  |

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