Income Taxes - Income Tax Expense (Benefit) Attributable to Loss From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current
U.S. Federal		$ 0
State and local	$ 53	22
Foreign	128	(210)
Total	181	(188)
Deferred
U.S. Federal		0
State and local	0	0
Foreign	(96)	(770)
Total	(96)	(770)
Total
U.S. Federal		0
State and local	53	22
Foreign	32	(980)
Total	$ 85	$ (958)