Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit [Line Items]
Computed “expected” tax-benefit - Federal	$ (9,453)	$ (14,870)
Computed “expected” tax-benefit - State	(1,101)	(1,732)
Adjustment of “expected” tax-benefit to actual	(431)	199
Meals, entertainment and other	10	8
Non-deductible stock-based compensation	574	877
Fair Market Value adjustment - Warrants	(4,332)	1,447
Change in valuation allowance	14,733	14,071
Income tax expense	$ 0	$ 0