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Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax benefit | $ (2,222) | $ (8,051) | $ (106) | $ (10,893) |
Corporate income tax rate |  |  | 21.00% |  | 35.00%
Latest Tax Year [Member] | Domestic Tax Authority [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income Taxes Receivable | $ 200 |  | $ 200 |  | $ 200
Latest Tax Year [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Tax Rate, Percent |  |  | (2.50%) | (231.33%) |
Income tax benefit |  |  | $ 100 |  |
Latest Tax Year [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Reversal of Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax benefit |  |  |  | $ (10,900) |

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