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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) - Customer concentration - customer
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Concentration of Major Customers      
Concentration Risk, Number of Customers 3    
Net revenue      
Concentration of Major Customers      
Percentage of revenue from customers to total revenue 90.00% 91.00% 86.00%
Net revenue | Largest customer      
Concentration of Major Customers      
Percentage of revenue from customers to total revenue 34.00% 35.00% 32.00%
Net revenue | Second largest customer      
Concentration of Major Customers      
Percentage of revenue from customers to total revenue 30.00% 30.00% 28.00%
Net revenue | Third largest customer      
Concentration of Major Customers      
Percentage of revenue from customers to total revenue 26.00% 26.00% 26.00%
Net revenue | Customers outside U.S.      
Concentration of Major Customers      
Percentage of revenue from customers to total revenue 1.00% 1.00% 1.00%