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STOCK-BASED COMPENSATION (Details 2) - Warrant [Member] - $ / shares
3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding at Begining 3,937,986 2,401,043
Granted 838,334 1,536,943
Exercised
Expired or cancelled
Outstanding at end 4,776,320 3,937,986
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Exercise Price [Roll Forward]    
Outstanding at Begining $ 1.45 $ 1.34
Granted $ 2.00 $ 1.63
Exercised
Expired or cancelled
Outstanding at end $ 1.55 $ 1.45