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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Abstract] |  |  |  |
Income tax benefit | $ 0 | $ 0 | $ 0 | $ 0
Net loss before income taxes | $ (15,038) | $ 8,451 | $ (47,432) | $ 1,097
Federal statutory tax rate |  |  | 21.00% |

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