Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

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Stock Options and Warrants (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Nov. 30, 2015
May. 31, 2015
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 31,008,915  
Granted, Number of Shares 14,074,092  
Forfeited /expired/ cancelled, Number of Shares (465,000)  
Options and warrants outstanding, Number of Shares 44,618,007 31,008,915
Outstanding exercisable - Number of Shares 41,406,237  
Exercised, Number of Shares 0  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.88  
Granted, Weighted Average Exercise Price 0.78  
Exercised, Weighted Average Exercise Price 0  
Forfeited/expired/cancelled, Weighted Average Exercise Price 0  
Options and warrants outstanding, Weighted Average Exercise Price 0.84 $ 0.88
Outstanding exercisable, Weighted Average Exercise Price $ 0.84  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 4 months 21 days 2 years 11 months 9 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 1 month 17 days  
Options and warrants outstanding , Aggregate Intrinsic Value $ 4,043,336 $ 5,538,335
Exercisable , Aggregate Intrinsic Value $ 3,959,503