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Income Taxes - Composition of Loss from Continuing Operations Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Domestic $ (2,087) $ (2,142)
Foreign
Loss from continuing operations before income taxes $ (2,087) $ (2,142)