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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Current        
Federal $ (33) $ (8,460) $ (33) $ (8,460)
State 3 3 (39) (36)
Total provision $ (30) $ (8,457) $ (72) $ (8,496)