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Income Taxes - 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 4 3 3
Foreign 197 142 95
Current income tax provision (benefit) 201 145 98
Deferred:      
Federal 0 (417) 0
State 0 0 0
Foreign 0 0 0
Deferred income tax provision (benefit) 0 (417) 0
Total $ 201 $ (272) $ 98