Redeemable Preferred Stock and Stockholders Equity - RSU and RSA activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Weighted-average grant date fair value (per share)
Stock-based compensation					$ 6,900	$ 5,400
Non-cash compensation expense not yet charged to net income					$ 13,500	$ 13,700
Percentage of shares of common stock issued and outstanding on a fully diluted basis					5.00%
RSAs | Certain employees
Number of shares
Outstanding, Beginning balance	1,058,816	941,427	940,514	872,079	872,079
Granted (in shares)		154,825	10,636	185,586
Vested (in shares)	(127,094)	(36,015)	(9,723)	(115,604)
Forfeited (in shares)	(42,945)
Canceled (in shares)		(1,421)		(1,547)
Outstanding, Ending balance	888,777	1,058,816	941,427	940,514	888,777	872,079
Grant date fair value
Beginning balance	$ 16,114	$ 14,317	$ 14,294	$ 13,737	$ 13,737
Granted		2,343	149	2,379
Vested	(1,966)	(526)	(126)	(1,801)
Forfeited	(631)
Canceled		(20)		(21)
Ending balance	$ 13,517	$ 16,114	$ 14,317	$ 14,294	$ 13,517	$ 13,737
Weighted-average grant date fair value (per share)
Beginning balance	$ 15.22	$ 15.21	$ 15.20	$ 15.75	$ 15.75
Granted (in per share)		15.14	14.03	12.82
Vested (in per share)	15.46	14.61	12.99	15.58
Forfeited (in per share)	14.68
Canceled (in per share)		14.26		13.50
Ending balance	$ 15.21	$ 15.22	$ 15.21	$ 15.20	$ 15.21	$ 15.75