Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of Options Granted But Not Exercised
Beginning balance (in shares)	1,725,494
Granted (in shares)	542,760
Exercised (in shares)	(109,578)
Forfeited (in shares)	(24,245)
Ending balance (in shares)	2,134,431	1,725,494
Exercisable (in shares)	930,390
Weighted-Average Remaining Contractual Life (in Years)
Outstanding	6 years 4 months 24 days	6 years 2 months 12 days
Exercisable	4 years 7 months 6 days
Weighted-Average Exercise Price Per Share
Outstanding (in dollars per share)	$ 12.45
Granted (in dollars per share)	20.35
Exercised (in dollars per share)	13.56
Forfeited (in dollars per share)	15.09
Outstanding (in dollars per share)	14.37	$ 12.45
Exercisable (in dollars per share)	$ 11.64
Aggregate Intrinsic Value (in Millions)
Outstanding	$ 21.4	$ 11.0
Exercised	1.2
Exercisable	$ 11.9