Income Taxes - Reconciliation of Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at January 1	$ 4,877	$ 2,725	$ 2,404
Addition for tax positions taken in the prior years	0		133
Reduction for tax positions taken in the prior years	(62)	(588)	(1,596)
Addition for tax positions taken in current year	2,607	2,740	1,784
Gross unrecognized tax benefits at December 31	$ 7,422	$ 4,877	$ 2,725