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Business Segments - Revenues generated following geographic regions (Details ) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 4,510 $ 6,767 $ 8,633 $ 13,384
Operating Segments | United States        
Segment Reporting Information [Line Items]        
Revenue 2,526 5,295 5,014 10,791
Operating Segments | Brazil        
Segment Reporting Information [Line Items]        
Revenue 928 398 1,654 437
Operating Segments | Rest of World        
Segment Reporting Information [Line Items]        
Revenue $ 1,056 $ 1,074 $ 1,965 $ 2,156