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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
segment
customer
Dec. 31, 2014
USD ($)
customer
Dec. 31, 2013
USD ($)
SEGMENT INFORMATION                      
Number of operating segments | segment                 1    
Segment information                      
Revenues $ 50,841 $ 61,534 $ 60,479 $ 59,580 $ 61,898 $ 65,280 $ 62,069 $ 60,435 $ 232,434 $ 249,682 $ 125,502
Identifiable assets 166,086       167,081       $ 166,086 $ 167,081  
Sales | Customer A                      
Segment information                      
Number of customers | customer                 1 1  
Percentage of concentration risk                 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                 $ 79,961 $ 85,152 53,989
Wholly owned foreign subsidiaries                      
Segment information                      
Revenues                 77,023 82,544 $ 50,053
Identifiable assets $ 56,444       $ 53,479       $ 56,444 $ 53,479