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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Loss from operations $ (10,984) $ (32,335) $ (36,172) $ (48,270)
Reportable Geographical Components        
Loss from operations (10,984) (32,335) (36,172) (48,270)
Americas | Operating Segments        
Loss from operations (16,599) (32,749) (50,122) (65,897)
EMEA | Operating Segments        
Loss from operations 386 (3,272) (2,948) 4,474
Asia Pacific | Operating Segments        
Loss from operations $ 5,229 $ 3,686 $ 16,898 $ 13,153