Equity incentive plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Options Outstanding
Outstanding, beginning balance (in shares)	18,932,979
Outstanding, ending balance (in shares)	20,342,259	18,932,979
2021 Stock incentive Plan
Options Outstanding
Outstanding, beginning balance (in shares)	18,532,979
Granted (in shares)	5,529,439
Exercised (in shares)	(2,923,761)
Canceled (in shares)	(1,196,398)
Outstanding, ending balance (in shares)	19,942,259	18,532,979
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 5.12
Granted (in USD per share)	21.97
Exercised (in USD per share)	3.75
Canceled (in USD per share)	10.02
Outstanding, ending balance (in USD per share)	$ 9.70	$ 5.12
Outstanding, Weighted Average Remaining Contractual Term (in years)	8 years 1 month 20 days	8 years 5 months 15 days
Outstanding, Aggregate Intrinsic Value	$ 226,350	$ 123,166
Vested and Expected to Vest, Awards Outstanding (in shares)	19,942,259
Vested and Expected to Vest, Weighted Average Exercise Price (in USD per shares)	$ 9.70
Vested and Expected to Vest, Weighted Average Remaining Contractual Term (in years)	8 years 1 month 20 days
Vested and Expected to Vest, Aggregate Intrinsic Value	$ 226,350
Exercisable, Awards Outstanding (in shares)	8,002,666
Exercisable, Weighted Average Exercise Price (in USD per share)	$ 4.77
Exercisable, Weighted Average Remaining Contractual Term (in years)	7 years 4 months 28 days
Exercisable, Aggregate Intrinsic Value	$ 118,769
Performance-Based Awards
Options Outstanding
Granted (in shares)		350,000	50,000
Performance-Based Awards | Amended and Restated 2010 Equity Incentive Plan
Options Outstanding
Outstanding, beginning balance (in shares)	400,000
Granted (in shares)	0
Exercised (in shares)	0
Canceled (in shares)	0
Outstanding, ending balance (in shares)	400,000	400,000
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 10.12
Granted (in USD per share)	0
Exercised (in USD per share)	0
Canceled (in USD per share)	0
Outstanding, ending balance (in USD per share)	$ 10.12	$ 10.12
Outstanding, Weighted Average Remaining Contractual Term (in years)	8 years 7 months 6 days	9 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value	$ 3,768	$ 660
Vested and Expected to Vest, Awards Outstanding (in shares)	400,000
Vested and Expected to Vest, Weighted Average Exercise Price (in USD per shares)	$ 10.12
Vested and Expected to Vest, Weighted Average Remaining Contractual Term (in years)	8 years 7 months 6 days
Vested and Expected to Vest, Aggregate Intrinsic Value	$ 3,768
Exercisable, Awards Outstanding (in shares)	2,083
Exercisable, Weighted Average Exercise Price (in USD per share)	$ 3.06
Exercisable, Weighted Average Remaining Contractual Term (in years)	6 years 6 months 29 days
Exercisable, Aggregate Intrinsic Value	$ 34