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Segment And Geographic Information (Schedule of Revenue by Geographic Location) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 78,893 $ 90,891 $ 78,626
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 37,277 44,681 35,598
Europe (including the Middle East and Africa) [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 19,065 19,600 13,958
Asia Pacific [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 22,551 $ 26,610 $ 29,070