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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment information          
Number of operating segments | segment     1    
Revenues $ 61,040 $ 61,534 $ 190,550 $ 181,593  
Identifiable assets $ 181,986   $ 181,986   $ 162,147
Sales | Customer A          
Segment information          
Percentage of concentration risk 24.00% 26.00% 20.00% 24.00%  
Sales | Customer B          
Segment information          
Percentage of concentration risk         18.00%
Trade receivables. | Customer A          
Segment information          
Percentage of concentration risk     14.00%    
Trade receivables. | Customer B          
Segment information          
Percentage of concentration risk     10.00%   19.00%
Outside the United States          
Segment information          
Revenues $ 26,670 $ 20,755 $ 84,903 $ 62,283  
Wholly owned international subsidiaries          
Segment information          
Revenues 23,218 $ 20,338 75,138 $ 58,556  
Identifiable assets $ 78,620   $ 78,620   $ 56,444