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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 0 $ 0 $ 0
State 454 424 574
Current income tax expense (benefit) 454 424 574
Deferred:      
Federal 0 0 0
State 0 0 0
Deferred tax expense (benefit) 0 0 0
Income Tax Expense (Benefit) $ 454 $ 424 $ 574