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Equity-Based Compensation - Schedule of Stock Options Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Options
Outstanding beginning balance (in shares)		7,227,296
Granted (in shares)		4,427,586
Exercise of options (in shares)	(22,240)	(342,246)
Forfeited (in shares)		(252,681)
Outstanding ending balance (in shares)		11,059,955	7,227,296
Exercisable (in shares)		5,207,872
Vested and expected to vest (in shares)		10,630,872
Weighted-Average Exercise Price
Outstanding beginning balance (in dollars per share)		$ 2.24
Granted (in dollars per share)		1.87
Exercised (in dollars per share)		1.60
Forfeited (in dollars per share)		2.38
Outstanding ending balance (in dollars per share)		2.11	$ 2.24
Exercisable, weighted-average exercise price (in dollars per share)		2.27
Vested and expected to vest, weighted-average exercise price (in dollars per share)		$ 2.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term (years)		7 years 6 months	6 years 9 months 18 days
Aggregate Intrinsic Value (thousands)		$ 397	$ 1,719
Exercisable, weighted-average remaining contractual term		5 years 8 months 12 days
Exercisable, aggregate intrinsic value		$ 389
Weighted-Average Remaining Contractual Term (years)		7 years 6 months
Aggregate Intrinsic Value (thousands)		$ 396

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