Stock-based compensation - Schedule of awards available for grant (Details) - shares shares in Thousands			3 Months Ended	9 Months Ended
	Jun. 16, 2021	Mar. 02, 2021	Sep. 30, 2021	Sep. 30, 2021
Restricted stock units
Shares
Non-option awards granted (in shares)				(47)
Performance stock units
Shares
Non-option awards granted (in shares)	(20)
2020 Equity Incentive Plan
Shares
Available for grant, beginning balance (in shares)				9,881
Options granted (in shares)				(546)
Options, RSUs, and PSUs forfeited (in shares)				669
Traded for taxes (returned to the pool) (in shares)				1,513
Available for grant, ending balance (in shares)			10,904	10,904
2020 Equity Incentive Plan | Restricted stock units
Shares
Options granted (in shares)			(40)
Non-option awards granted (in shares)				(47)
2020 Equity Incentive Plan | Performance stock units
Shares
Non-option awards granted (in shares)		(500)		(566)