Stock-Based Compensation - Schedule Options to Purchase Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Number of Shares
Number of shares, options outstanding, beginning balance (in shares)	10,086,167
Granted (in shares)	4,323,937
Exercised (in shares)	(277,323)
Forfeited (in shares)	(130,327)
Number of shares, options outstanding, ending balance (in shares)	14,002,454	10,086,167
Options exercisable (in shares)	2,913,960
Weighted-Average Exercise Price
Beginning balance, weighted average exercise price (in USD per share)	$ 2.59
Weighted average exercise price, granted (in USD per share)	4.42
Weighted average exercise price, exercised (in USD per share)	0.65
Weighted average exercise price, cancelled (in USD per share)	6.48
Ending balance, weighted average exercise price (in USD per share)	3.16	$ 2.59
Weighted average exercise price, options exercisable (in USD per share)	$ 2.37
Additional Disclosures
Weighted average remaining contractual life	8 years 10 months 24 days	8 years 9 months 18 days
Weighted average remaining contractual life, options exercisable	8 years 3 months 18 days
Aggregate intrinsic value	$ 14,468	$ 24,664
Aggregate intrinsic value, options exercisable	$ 4,431