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Redeemable convertible preferred stock (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) | 0 | 86,348,646 |  |
Shares Issued (in shares) | 0 | 85,391,338 |  |
Shares Outstanding (in shares) | 0 | 85,391,338 | 79,472,483 | 79,472,483
Carrying Value | $ 0 | $ 274,104,000 | $ 155,645,000 | $ 155,645,000
Liquidation Amount | $ 0 | $ 274,009,000 |  |
Series A |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 8,483,166 |  |
Shares Issued (in shares) |  | 8,483,166 |  |
Shares Outstanding (in shares) |  | 8,483,166 |  |
Issuance Price Per Share (in dollars per share) |  | $ 0.24 |  |
Carrying Value |  | $ 2,010,000 |  |
Liquidation Amount |  | $ 2,050,000 |  |
Series A-1 |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 15,295,184 |  |
Shares Issued (in shares) |  | 15,132,282 |  |
Shares Outstanding (in shares) |  | 15,132,282 |  |
Issuance Price Per Share (in dollars per share) |  | $ 0.20 |  |
Carrying Value |  | $ 5,765,000 |  |
Liquidation Amount |  | $ 2,966,000 |  |
Series B |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 22,956,103 |  |
Shares Issued (in shares) |  | 22,956,103 |  |
Shares Outstanding (in shares) |  | 22,956,103 |  |
Issuance Price Per Share (in dollars per share) |  | $ 0.54 |  |
Carrying Value |  | $ 12,230,000 |  |
Liquidation Amount |  | $ 12,310,000 |  |
Series C |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 16,198,348 |  |
Shares Issued (in shares) |  | 16,198,348 |  |
Shares Outstanding (in shares) |  | 16,198,348 |  |
Issuance Price Per Share (in dollars per share) |  | $ 1.98 |  |
Carrying Value |  | $ 31,901,000 |  |
Liquidation Amount |  | $ 32,000,000 |  |
Series D |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 16,702,584 |  |
Shares Issued (in shares) |  | 16,702,584 |  |
Shares Outstanding (in shares) |  | 16,702,584 |  |
Issuance Price Per Share (in dollars per share) |  | $ 6.22 |  |
Carrying Value |  | $ 103,739,000 |  |
Liquidation Amount |  | $ 103,852,000 |  |
Series E |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 2,569,043 |  |
Shares Issued (in shares) |  | 2,569,043 |  |
Shares Outstanding (in shares) |  | 2,569,043 |  |
Issuance Price Per Share (in dollars per share) |  | $ 15.57 |  |
Carrying Value |  | $ 39,948,000 |  |
Liquidation Amount |  | $ 40,000,000 |  |
Series F |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Shares Authorized (in shares) |  | 4,144,218 |  |
Shares Issued (in shares) |  | 3,349,812 |  |
Shares Outstanding (in shares) |  | 3,349,812 |  |
Issuance Price Per Share (in dollars per share) |  | $ 24.13 |  |
Carrying Value |  | $ 78,511,000 |  |
Liquidation Amount |  | $ 80,831,000 |  |

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