Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ (106)	$ 76
State	45	138
Foreign	0	0
Total current	(61)	214
Deferred expense
Federal	(747)	0
State	(570)	39
Foreign	0	0
Total deferred	(1,317)	39
Total income tax expense	$ (1,378)	$ 253