Income taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 47,420	$ 19,362
Valuation allowance, period increase (decrease)	28,000	(6,800)
Unrecognized tax benefits	18,533	971	$ 651	$ 180
Unrecognized tax benefits that would impact effective tax rate	100
Domestic Tax Authority | Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	224,400	49,500
Domestic Tax Authority | Federal | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Research and development tax credit	4,000	2,100
Domestic Tax Authority | Federal | Operating Loss Carryforwards Expiration Year, Unlimited
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	215,900	49,500
State and Local Jurisdiction | California Franchise Tax Board
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	146,800	70,000
State and Local Jurisdiction | California Franchise Tax Board | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Research and development tax credit	$ 2,300	$ 100