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Equity Instruments - Common Stock Reserved for Issuance (Details) - shares | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 29, 2021
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Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 67,319,230 |  | 59,504,320 | 66,830,878
Common stock warrants |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 13,145,000 |  | 13,075,000 |
Restricted Stock Units (RSUs) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 6,198,472 |  | 4,041,346 |
Common stock options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 17,731,063 |  | 21,191,226 |
Shares available for future grant under 2021 Equity Incentive Plan | 2021 Stock Option Plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 24,749,094 |  | 17,533,471 |
Reserved for employee stock purchase plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock reserved (in shares) | 5,495,601 | 1,832,324 | 3,663,277 |

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