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Business Segments - Revenues generated following geographic regions (Details ) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Revenue $ 6,904 $ 4,510 $ 11,738 $ 8,633
Operating Segments | United States        
Segment Reporting Information [Line Items]        
Revenue 6,180 2,526 9,920 5,014
Operating Segments | Brazil        
Segment Reporting Information [Line Items]        
Revenue 297 928 601 1,654
Operating Segments | Rest of World        
Segment Reporting Information [Line Items]        
Revenue $ 427 $ 1,056 $ 1,217 $ 1,965