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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Concentration risk by major customer - customer
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Concentration of Major Customers        
Number of major customers     3  
Net revenue        
Concentration of Major Customers        
Percentage of revenue from customers to total revenue 87.00% 89.00% 89.00% 89.00%
Net revenue | Largest wholesaler        
Concentration of Major Customers        
Percentage of revenue from customers to total revenue 33.00% 35.00% 33.00% 35.00%
Net revenue | Second largest wholesaler        
Concentration of Major Customers        
Percentage of revenue from customers to total revenue 29.00% 29.00% 30.00% 29.00%
Net revenue | Third largest wholesaler        
Concentration of Major Customers        
Percentage of revenue from customers to total revenue 25.00% 25.00% 26.00% 25.00%