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Business Segments - Revenues generated following geographic regions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 5,905 $ 5,899 $ 12,997 $ 17,637
Operating Segments | United States        
Segment Reporting Information [Line Items]        
Revenue 5,213 4,929 10,326 14,849
Operating Segments | Rest of World        
Segment Reporting Information [Line Items]        
Revenue $ 692 $ 970 $ 2,671 $ 2,788