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Revenue (Schedule of Revenue by Geographic Location) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 17,077 $ 24,621 $ 32,675 $ 41,046
North America [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 8,457 14,222 16,218 23,209
Europe (including the Middle East and Africa) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 4,191 3,414 7,586 6,478
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 4,429 $ 6,985 $ 8,871 $ 11,359