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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Loss [Abstract]    
Foreign currency translation   $ 71
Unrealized gains / (losses) on marketable securities $ (160) (236)
Accumulated other comprehensive loss $ (160) $ (165)