Income Taxes - Schedule of Uncertain Tax Positions (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	$ 18,665	$ 18,648	$ 18,323
Additions for tax positions related to the current year	3
Reductions for tax positions related to the prior year	(3)	17	325
Ending balance	$ 18,665	$ 18,665	$ 18,648