Income Taxes - Reconciliation of Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Uncertain Tax Positions [Roll Forward]
Beginning balance of uncertain tax positions	$ 5,292	$ 9,788
Additions related to current year tax positions	0	0
Reductions related to prior year tax positions	0	(4,496)
Settlements	0	0
Lapse of statute of limitations	0	0
Ending balance of uncertain tax positions	$ 5,292	$ 5,292