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BUSINESS SEGMENTS AND MAJOR CUSTOMERS - Revenues generated from geographic regions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenue $ 3,929 $ 5,899 $ 6,904 $ 4,834 $ 6,946 $ 4,041 $ 4,510 $ 4,123 $ 21,566 $ 19,621 $ 23,720
Operating Segments | United States                      
Segment Reporting Information [Line Items]                      
Revenue                 17,806 11,737 18,168
Operating Segments | Brazil                      
Segment Reporting Information [Line Items]                      
Revenue                 1,302 2,163 848
Operating Segments | Rest of World                      
Segment Reporting Information [Line Items]                      
Revenue                 $ 2,458 $ 5,721 $ 4,704