Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Receivable allowance	$ 68	$ 17
Accumulated depreciation	226	371
Restructuring accrual	242	454
Intangible assets	0	813
Compensation expense	664	634
Federal net operating loss carryforward	3,674	61,688
State net operating loss carryforward	1,124	5,736
Accrued expenses	773	160
Deferred rent	22	57
Deferred revenue	503	83
Interest	230	180
Other	32	10
Gross deferred income tax assets	7,558	70,203
Valuation allowance	(6,520)	(70,203)
Net deferred income tax assets	1,038	0
Deferred income tax liabilities:
Intangible Assets	(1,038)	0
Goodwill	(18)	(16)
Gross deferred income tax liabilities	(1,056)	(16)
Net deferred income tax liabilities	$ (18)	$ (16)