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Income Taxes - (Benefit) Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
Federal $ 0 $ (33) $ (8,719)
State 0 (38) (30)
Current, total 0 (71) (8,749)
Deferred      
Federal 0 0 0
State 0 0 0
Deferred, total 0 0 0
Total (benefit) provision $ 0 $ (71) $ (8,749)