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Income Taxes (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net change in the valuation allowance | $ (17,490) | $ 1,002 | $ 1,476
Income tax benefits for option and warrant exercises | $ 6,500 |  |
Revised U.S. corporate tax rate | 21.00% |  |
Reduction in deferred tax asset revaluation | $ 1,600 |  |
Domestic Tax Authority [Member] |  |  |
Net operating loss carry-forwards | $ 10,700 |  |
Operating loss carry forwards expiration dates description | Expire beginning in Fiscal 2034 through 2037 |  |
State and Local Jurisdiction [Member] |  |  |
Net operating loss carry-forwards | $ 1,800 |  |
Operating loss carry forwards expiration dates description | Expire beginning in Fiscal 2019 through 2037 |  |
Tax Cuts and Jobs Act [Member] | Minimum [Member] |  |  |
U.S. corporate tax rate | 15.00% |  |
Tax Cuts and Jobs Act [Member] | Maximum [Member] |  |  |
U.S. corporate tax rate | 35.00% |  |

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