Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 0	$ 0
State	(32)	104
Foreign	0	(485)
Total current income tax (benefit) expense	(32)	(381)
Deferred:
Federal	(112)	0
State	0	(22)
Foreign	0	0
Total deferred income tax (benefit) expense	(112)	(22)
Total income tax (benefit) expense	$ (144)	$ (403)