Summary of Significant Accounting Policies - Amounts reclassified (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification [Line Items]
Sales and marketing	$ 21,978	$ 22,835	$ 26,495
General and administrative	$ 50,022	47,479	45,200
As previously reported
Reclassification [Line Items]
Sales and marketing		24,185	27,774
General and administrative		46,129	43,921
Re-classifications
Reclassification [Line Items]
Sales and marketing		(1,350)	(1,279)
General and administrative		$ 1,350	$ 1,279