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