Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

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Stock Options and Warrants (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 31,008,915  
Granted, Number of Shares 8,994,921  
Exercised, Number of Shares 0  
Forfeited /expired/ cancelled, Number of Shares 0  
Options and warrants outstanding, Number of Shares 40,003,836 31,008,915
Outstanding exercisable - Number of Shares 37,900,398  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.88  
Granted, Weighted Average Exercise Price 0.77  
Exercised, Weighted Average Exercise Price 0  
Forfeited/expired/cancelled, Weighted Average Exercise Price 0  
Options and warrants outstanding, Weighted Average Exercise Price 0.86 $ 0.88
Outstanding exercisable, Weighted Average Exercise Price $ 0.86  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 2 months 16 days 2 years 11 months 9 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 1 month 13 days  
Options and warrants outstanding , Aggregate Intrinsic Value $ 1,322,175 $ 5,538,335
Exercisable , Aggregate Intrinsic Value $ 1,281,509