Stock-based compensation - Schedule of conversion of the vested and unvested options (Details) - 2018 Stock Plan - shares shares in Thousands		3 Months Ended				9 Months Ended	10 Months Ended
	Mar. 06, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Shares
Options outstanding, beginning balance (in shares)		4,291	4,552	4,600	2,734	4,600	4,678
Cashed out (in shares)					(829)
Forfeitures / cancelled in period (in shares)		(1)	(3)	(11)	(19)		(50)
Converted vested balance (in shares)	4,314
Converted unvested balance (in shares)	364
Exercised in period (in shares)		(687)	(257)	(37)		(1,010)	(28)
Options outstanding, ending balance (in shares)	4,678	3,603	4,291	4,552	1,887	3,603	4,600