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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Foreign currency translation $ 77 $ 71
Unrealized gains / (losses) on marketable securities (63) (236)
Accumulated other comprehensive loss $ 14 $ (165)