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Operating Segments, Geographic Information and Significant Customers (Schedule Of Long-Lived Assets By Geographical Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total $ 71,209 $ 33,426
United States    
Segment Reporting Information [Line Items]    
Total 70,710 32,876
China    
Segment Reporting Information [Line Items]    
Total $ 499 $ 550