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