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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Loss [Abstract]    
Foreign currency translation $ (2)  
Unrealized losses on marketable securities (264) $ (160)
Accumulated other comprehensive loss $ (266) $ (160)