Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of unrecognized tax benefits
Balance at beginning of year	$ 520	$ 16,850	$ 663
Additions for tax positions of current year	499	0	0
Additions for tax positions of prior years	5,465	0	16,187
Reductions for tax positions of prior years	0	(16,330)	0
Balance at end of year	$ 6,484	$ 520	$ 16,850