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FINANCIAL INSTRUMENTS (Details 3)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
customer
Dec. 31, 2015
USD ($)
customer
Credit Risk    
Number of major customers | customer 3 3
Amount of allowance for doubtful accounts | $ $ 0 $ 0
Accounts receivable | Credit risk | Major customer one    
Credit Risk    
Concentration risk (as a percent) 30.00% 34.00%
Accounts receivable | Credit risk | Major customer two    
Credit Risk    
Concentration risk (as a percent) 30.00% 28.00%
Accounts receivable | Credit risk | Major customer three    
Credit Risk    
Concentration risk (as a percent) 28.00% 27.00%