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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 0 $ 0 $ 0
State 476 454 424
Current income tax expense (benefit) 476 454 424
Deferred:      
Federal 0 0 0
State 0 0 0
Deferred tax expense (benefit) 0 0 0
Income tax provision $ 476 $ 454 $ 424