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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
customer
Dec. 31, 2015
USD ($)
customer
Dec. 31, 2014
USD ($)
customer
Segment information                      
Number of operating segments | segment                 1    
Revenues $ 55,343 $ 61,040 $ 65,835 $ 63,675 $ 50,841 $ 61,534 $ 60,479 $ 59,580 $ 245,893 $ 232,434 $ 249,682
Identifiable assets 179,919       162,147       $ 179,919 $ 162,147  
Sales | Customer A                      
Segment information                      
Number of customers | customer                 1 1 1
Percentage of concentration risk                 19.00% 24.00% 23.00%
Trade receivables | Customer A                      
Segment information                      
Number of customers | customer                   1 1
Percentage of concentration risk                   12.00% 23.00%
Trade receivables | Customer B                      
Segment information                      
Number of customers | customer                   1 1
Percentage of concentration risk                   15.00% 15.00%
Outside the United States                      
Segment information                      
Revenues                 $ 111,993 $ 80,029 $ 85,152
Identifiable assets $ 73,378       $ 56,444       73,378 56,444  
Wholly owned international subsidiaries                      
Segment information                      
Revenues                 $ 99,061 $ 77,509 $ 82,544