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Income Taxes - Components of Income Tax Benefit (Provision) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 0 $ 0 $ 0
State (11) 1 2
Foreign (4) 21 (1)
Total current (15) 22 1
Deferred:      
Federal 0 0 0
State 0 0 0
Foreign 0 0 0
Total deferred 0 0 0
Total income tax benefit (provision) $ (15) $ 22 $ 1