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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Current        
Federal $ 0 $ 0 $ 0 $ 0
State (45) (42) (42) (39)
Total provision $ (45) $ (42) $ (42) $ (39)