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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Components Of Income Tax Expense Benefit [Line Items] |  |
Computed "expected" tax-benefit - Federal | $ (2,818) | $ (5,267)
Computed "expected" tax-benefit - State | (636) | (613)
Adjustment of "expected" tax-benefit to actual | 19 | (2)
Meals, entertainment and other | 3 | 10
Non-deductible stock-based compensation | 266 | 502
Fair Market Value Adjustment - Warrants | (1,051) | (4,076)
Impact of U.S. tax reform | 0 | 21,555
Change in valuation allowance | 4,217 | (12,109)
Income tax expense | $ 0 | $ 0

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