Stock-Based Compensation - Options Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Number of Options
Outstanding (in shares)	6,329,822
Granted (in shares)	87,387
Exercised (in shares)	(197,828)
Forfeited (in shares)	(67,540)
Outstanding (in shares)	6,151,841	6,329,822
Options exercisable (in shares)	3,645,386
Weighted-Average Exercise Price (per share)
Outstanding (in dollars per share)	$ 2.32
Granted (in dollars per share)	15.48
Exercised (in dollars per share)	1.55
Forfeited (in dollars per share)	2.01
Outstanding (in dollars per share)	2.54	$ 2.32
Options exercisable (in dollars per share)	$ 1.19
Weighted-Average Remaining Contractual Term (in years)
Outstanding	7 years 11 months 1 day	8 years 1 month 20 days
Options exercisable	7 years 8 months 23 days