Income Taxes - Schedule of Change in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Valuation allowance, at beginning of year	$ 109,625	$ 107,046	$ 115,689
Decrease in valuation allowance - ASC 606 impact		0	(1,457)	$ 0
Increase in valuation allowance - operating lease impact	(915)	0	0
Valuation allowance, at beginning of year, as adjusted		108,710	105,589	$ 115,689
Increase in valuation allowance, excluding Tax Act impact	2,483	4,036	45,512
Decrease in valuation allowance - federal tax rate change	0	0	52,757
Release of valuation allowance due to the Tax Act	0	0	(1,398)
Valuation allowance, at end of year	$ 111,193	$ 109,625	$ 107,046