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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%