Stock-Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended	18 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
2014 Plan
Number of Shares
Beginning balance (in shares)	8,371,097
Granted (in shares)	0		0
Exercised (in shares)	(275,435)
Forfeited (in shares)	0
Ending balance (in shares)	8,095,662	8,371,097	8,095,662
Exercisable (in shares)	8,075,235		8,075,235
Unvested (in shares)	20,427		20,427
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 0.29
Granted (in dollars per share)	0
Exercised (in dollars per share)	0.22
Forfeited (in dollars per share)	0
Ending balance (in dollars per share)	0.30	$ 0.29	$ 0.30
Exercisable (in dollars per share)	0.29		0.29
Unvested (in dollars per share)	$ 2.62		$ 2.62
Additional Disclosures
Options outstanding, weighted-average remaining contractual term	7 years 29 days	7 years 3 months 29 days
Options exercisable, weighted-average remaining contractual term	7 years 29 days
Options unvested, weighted-average remaining contractual term	8 years 3 months
Options outstanding, aggregate intrinsic value	$ 16,930	$ 25,773	$ 16,930
Options exercisable, aggregate intrinsic value	16,915		16,915
Options unvested, aggregate intrinsic value	$ 15		$ 15
2021 Plan
Number of Shares
Beginning balance (in shares)	346,603
Granted (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Ending balance (in shares)	346,603	346,603	346,603
Exercisable (in shares)	115,534		115,534
Unvested (in shares)	231,069		231,069
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 10.45
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Ending balance (in dollars per share)	10.45	$ 10.45	$ 10.45
Exercisable (in dollars per share)	10.45		10.45
Unvested (in dollars per share)	$ 10.45		$ 10.45
Additional Disclosures
Options outstanding, weighted-average remaining contractual term	9 years 3 months	9 years 6 months
Options exercisable, weighted-average remaining contractual term	9 years 3 months
Options unvested, weighted-average remaining contractual term	9 years 3 months
Options outstanding, aggregate intrinsic value	$ 0	$ 0	$ 0
Options exercisable, aggregate intrinsic value	0		0
Options unvested, aggregate intrinsic value	$ 0		$ 0
Granted - service conditions | 2021 Plan
Number of Shares
Granted (in shares)	0
Weighted- Average Exercise Price
Granted (in dollars per share)	$ 0
Granted - performance conditions | 2021 Plan
Number of Shares
Granted (in shares)	0
Weighted- Average Exercise Price
Granted (in dollars per share)	$ 0