Income Taxes - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes
Loss before income taxes	$ (5,709)	$ (2,536)	$ (1,516)
Income or loss from foreign sources	0
Current:
US federal	(4)	3	1
State and local	47	35	12
Total current income tax expense	43	38	13
Deferred:
US federal	440	278	(410)
State and local	58	12	(12)
Total deferred income tax expense	498	290	(422)
Total income tax expense (benefit)	$ 541	$ 328	$ (409)
Effective tax rate	(9.50%)	(12.90%)	27.00%