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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Components Of Income Tax Expense Benefit [Line Items] |  |
Computed “expected” tax-benefit - Federal | $ (5,267) | $ (9,453)
Computed “expected” tax-benefit - State | (613) | (1,101)
Adjustment of “expected” tax-benefit to actual | (2) | (431)
Meals, entertainment and other | 10 | 10
Non-deductible stock-based compensation | 502 | 574
Fair Market Value Adjustment - Warrants | (4,076) | (4,332)
Impact of U.S. tax reform | 21,555 | 0
Change in valuation allowance | (12,109) | 14,733
Income tax expense | $ 0 | $ 0

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