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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Current Federal
Current State and local
Current Foreign 41
Current Income Tax Expense (Benefit) 41
Deferred Federal
Deferred State and local
Deferred Foreign
Deferred Income Tax Expense (Benefit)
Total income tax expense $ 41