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Summary of Significant Accounting Policies (Schedule of Revenue by Geographic Location) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 21,578 $ 20,073 $ 40,940 $ 44,988
North America [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 9,204 10,227 17,015 21,012
Europe (including the Middle East and Africa) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 3,687 2,909 7,700 7,233
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 8,687 $ 6,937 $ 16,225 $ 16,743