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Income Taxes - Reconciliation of Expected Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Tax at federal income tax rate $ 316 $ 962
State provision (51) (29)
Foreign tax differential 3 2
Change in valuation allowance 8,898 (917)
Impact related to tax reform (8,791)
Permanent items (441) (56)
Total Tax Provision $ (66) $ (38)