Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Details
Income tax benefit at statutory federal rate	$ (3,723)	$ (6,179)
Increase (reduction) in income taxes resulting from:
Nondeductible expenses	7	69
Fair value adjustment on convertible notes	2	226
State and local income taxes, net of federal income tax benefit	(505)	(799)
Federal valuation allowance	3,714	5,884
State valuation allowance	505	799
Total income tax expense benefit