Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 25	$ (35)	$ 43
State	600	499	620
Foreign	119	109	269
Total	744	573	932
Deferred:
Federal	(138)	17,406	(2,137)
State	(818)	13,799	(1,277)
Foreign	24	(46)	4
Total	(932)	31,159	(3,410)
Income tax (benefit) expense	$ (188)	$ 31,732	$ (2,478)