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Income Taxes, Valuation Allowance, Operating Loss Carryforwards and Tax Credit Carry-forwards (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |
Net change in valuation allowance | $ 1,816 |
Income Taxes [Abstract] |  |
Net operating loss carryforwards | 19,573 | $ 25,403
Federal [Member] |  |
Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 131,055 |
Operating loss carryforwards, expiration dates | Dec. 31, 2028 |
Federal [Member] | Research and Development [Member] |  |
Tax credit carryforwards [Abstract] |  |
Tax credit carryforwards | $ 1,730 |
Federal tax credit carryforward, expiration dates | Dec. 31, 2032 |
State [Member] |  |
Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 107,989 |
Operating loss carryforwards, expiration dates | Dec. 31, 2029 |

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