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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Foreign currency translation $ 84 $ 71
Unrealized gains / (losses) on marketable securities (37) (236)
Accumulated other comprehensive loss $ 47 $ (165)