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Revenue (Schedule of Revenue by Geographic Location) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 19,082 $ 21,915 $ 51,757 $ 62,961
North America [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 8,971 10,393 25,189 33,165
Europe (including the Middle East and Africa) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 4,339 4,940 11,925 11,423
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 5,772 $ 6,582 $ 14,643 $ 18,373