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Common stock (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 vote shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Class of Stock [Line Items] |  |  |
Number of votes per common stock | vote | 1 |  |
Conversion of redeemable convertible preferred stock (in shares) | 0 | 85,391,338 |
Warrants for redeemable convertible preferred stock (in shares) | 0 | 12,595 | 12,595
Stock options outstanding to purchase common stock (in shares) | 20,342,259 | 18,932,979 |
Total shares of common stock reserved (in shares) | 34,559,618 | 108,254,073 |
2010 Equity Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Stock options available for future issuance (in shares) | 0 | 3,917,161 |
2021 Equity Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Stock options available for future issuance (in shares) | 11,417,359 | 0 |
2021 Employee Stock Purchase Plan |  |  |
Class of Stock [Line Items] |  |  |
Stock options available for future issuance (in shares) | 2,800,000 | 0 |
Stock Appreciation Rights |  |  |
Class of Stock [Line Items] |  |  |
Equity instruments other than options, outstanding (in shares) | 106,155 | 95,475 |

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