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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Federal $ 0 $ (10) $ 271 $ 142
State 0 (2) 46 25
Tax expense (benefit) $ 0 $ (12) $ 317 $ 167