Income Taxes - Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 8,740	$ 5,887	$ 2,517
Additions based on tax positions related to the current year	132	2,925	3,398
Additions for tax positions of prior years	4	2	92
Reductions for tax positions of prior years	(1,285)		(49)
Reductions as a result of a lapse of applicable statute of limitations	(53)	(22)	(5)
Other	321	(52)	(66)
Ending balance	$ 7,859	$ 8,740	$ 5,887