Stockholders’ Equity and Stock-based Compensation - Schedule of Options Activity (Details) - USD ($)		9 Months Ended	12 Months Ended
	Aug. 13, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Total Options
Beginning balance (in shares)		7,422,996
Vested exercised (in shares)	(807,970)	(1,297,711)
Forfeitures (in shares)		1,820,625
Ending balance (in shares)		4,304,660	7,422,996
Weighted- Average Exercise Price Per Share
Options outstanding, weighted-average exercise price per share (in dollars per share)		$ 0.27	$ 0.20
Stock Options Additional Disclosures
Total options exercisable (in shares)		2,662,485
Options exercisable, weighted-average exercise price per share (in dollars per share)		$ 0.26
Options outstanding, weighted-average remaining contractual term (in years)		7 years 7 months 20 days	8 years 5 months 26 days
Options exercisable, weighted-average remaining contractual term (in years)		7 years 3 months 10 days
Options outstanding, aggregate intrinsic value		$ 44,275,000	$ 130,564,000
Options vested exercised, aggregate intrinsic value		15,263,000
Options exercisable, aggregate intrinsic value		$ 27,526,000		$ 21,400,000
Vested and Expected to Vest
Total options vested and expected to vest (in shares)		4,304,660
Options vested and expected to vest, weighted-average exercise price per share (in dollars per share)		$ 0.27
Options vested and expected to vest, weighted-average remaining contractual term (in years)		7 years 7 months 20 days
Options vested and expected to vest, aggregate intrinsic value		$ 44,275,000