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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Loss from operations $ (7,722) $ (6,864) $ (25,188) $ (15,935)
Reportable Geographical Components        
Loss from operations (7,722) (6,864) (25,188) (15,935)
Americas | Operating Segments        
Loss from operations (13,539) (16,937) (33,523) (33,152)
EMEA | Operating Segments        
Loss from operations (2,119) 4,119 (3,334) 7,748
Asia Pacific | Operating Segments        
Loss from operations $ 7,936 $ 5,954 $ 11,669 $ 9,469