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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment information          
Number of operating segments | segment     1    
Revenues $ 65,835 $ 60,479 $ 129,510 $ 120,059  
Identifiable assets $ 183,754   $ 183,754   $ 162,147
Sales | Customer A          
Segment information          
Percentage of concentration risk 19.00% 23.00% 19.00% 23.00%  
Sales | Customer B          
Segment information          
Percentage of concentration risk   10.00%      
Trade receivables. | Customer A          
Segment information          
Percentage of concentration risk     16.00%   16.00%
Trade receivables. | Customer B          
Segment information          
Percentage of concentration risk     14.00%   16.00%
Outside the United States          
Segment information          
Revenues $ 29,659 $ 21,714 $ 58,234 $ 41,528  
Wholly owned international subsidiaries          
Segment information          
Revenues 26,313 $ 20,791 51,920 $ 38,218  
Identifiable assets $ 79,715   $ 79,715   $ 56,444