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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment information          
Number of operating segments | segment     1    
Identifiable assets $ 222,113   $ 222,113   $ 187,922
Total Revenue          
Segment information          
Percentage of concentration risk 20.00% 18.00% 20.00% 19.00%  
Trade receivables          
Segment information          
Percentage of concentration risk     22.00%   15.00%
Outside the United States          
Segment information          
Revenues derived from foreign subsidiaries $ 36,216 $ 30,409 $ 111,073 $ 86,130  
Wholly owned foreign subsidiaries          
Segment information          
Revenues derived from foreign subsidiaries 30,717 $ 27,265 96,618 $ 77,360  
Identifiable assets $ 91,587   $ 91,587   $ 84,652