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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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 19
Deferred Income Tax Expense (Benefit) 19
Total income tax expense $ 41 $ 19