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Redeemable, Convertible Preferred Stock - Changes (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Feb. 29, 2020 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 25,729,542 | 25,729,542 | 23,695,330
Beginning balance, temporary equity |  |  |  | $ 394,408 | $ 394,408 | $ 347,938
Issuance of preferred stock (in shares) |  |  |  | 3,634,210 | 3,792,268 | 2,034,212
Issuance of preferred stock |  |  |  | $ 83,073 | $ 86,223 | $ 46,470
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 29,521,810 | 29,521,810 | 25,729,542
Ending balance, temporary equity |  |  |  | $ 480,631 | $ 480,631 | $ 394,408
Series A |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 4,666,503 | 4,666,503 | 4,666,503
Beginning balance, temporary equity |  |  |  | $ 12,230 | $ 12,230 | $ 12,230
Issuance of preferred stock (in shares) |  |  |  |  | 0 | 0
Issuance of preferred stock |  |  |  |  | $ 0 | $ 0
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 4,666,503 | 4,666,503
Ending balance, temporary equity |  |  |  |  | $ 12,230 | $ 12,230
Series B |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 1,733,370 | 1,733,370 | 1,733,370
Beginning balance, temporary equity |  |  |  | $ 18,000 | $ 18,000 | $ 18,000
Issuance of preferred stock (in shares) |  |  |  |  | 0 | 0
Issuance of preferred stock |  |  |  |  | $ 0 | $ 0
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 1,733,370 | 1,733,370
Ending balance, temporary equity |  |  |  |  | $ 18,000 | $ 18,000
Series C |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 4,142,408 | 4,142,408 | 4,142,408
Beginning balance, temporary equity |  |  |  | $ 60,850 | $ 60,850 | $ 60,850
Issuance of preferred stock (in shares) |  |  |  |  | 0 | 0
Issuance of preferred stock |  |  |  |  | $ 0 | $ 0
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 4,142,408 | 4,142,408
Ending balance, temporary equity |  |  |  |  | $ 60,850 | $ 60,850
Series D |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 10,003,304 | 10,003,304 | 10,003,304
Beginning balance, temporary equity |  |  |  | $ 185,252 | $ 185,252 | $ 185,252
Issuance of preferred stock (in shares) |  |  |  |  | 158,058 | 0
Issuance of preferred stock |  | $ 3,150 |  |  | $ 3,150 | $ 0
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 10,161,362 | 10,003,304
Ending balance, temporary equity |  |  |  |  | $ 188,402 | $ 185,252
Series E |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 5,183,957 | 5,183,957 | 3,149,745
Beginning balance, temporary equity |  |  |  | $ 118,076 | $ 118,076 | $ 71,606
Issuance of preferred stock (in shares) |  |  | 2,034,212 |  | 0 | 2,034,212
Issuance of preferred stock |  |  | $ 46,470 |  | $ 0 | $ 46,470
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 5,183,957 | 5,183,957
Ending balance, temporary equity |  |  |  |  | $ 118,076 | $ 118,076
Series F |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  | 0 | 0 | 0
Beginning balance, temporary equity |  |  |  | $ 0 | $ 0 | $ 0
Issuance of preferred stock (in shares) | 3,634,210 |  |  |  | 3,634,210 | 0
Issuance of preferred stock | $ 83,073 |  |  |  | $ 83,073 | $ 0
Ending balance, Redeemable Convertible Preferred Stock (in shares) |  |  |  |  | 3,634,210 | 0
Ending balance, temporary equity |  |  |  |  | $ 83,073 | $ 0

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