Income Taxes - Components of (Benefit) Provision for Income Taxes from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current income tax (benefit) provision:
Federal	$ (102)	$ (8)
State	101	72
Foreign	3
Total current	2	64
Deferred income tax benefit:
Federal	(36)	(4,269)
State		(429)
Total deferred	(36)	(4,698)
Total income tax benefit	$ (34)	$ (4,634)