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CONCENTRATION OF RISK - Revenues and Accounts Receivable From Our Largest Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Concentration Risk [Line Items]          
Accounts receivable $ 17,984   $ 17,984   $ 24,729
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer A [Member]          
Concentration Risk [Line Items]          
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) 76.00% 74.00% 64.00% 63.00%  
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer B [Member]          
Concentration Risk [Line Items]          
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) 18.00% 18.00% 29.00% 21.00%  
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer C [Member]          
Concentration Risk [Line Items]          
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) 3.00% 1.00% 4.00% 1.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer A [Member]          
Concentration Risk [Line Items]          
Accounts receivable $ 6,298   $ 6,298    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer B [Member]          
Concentration Risk [Line Items]          
Accounts receivable 9,055   9,055    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer C [Member]          
Concentration Risk [Line Items]          
Accounts receivable $ 2,309   $ 2,309