Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

v3.3.1.900
Stock Options and Warrants (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Feb. 29, 2016
May. 31, 2015
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 31,008,915  
Granted, Number of Shares 32,581,111  
Exercised, Number of Shares (388,442)  
Forfeited/expired/cancelled, Number of Shares (465,000)  
Options and warrants outstanding, Number of Shares 62,736,584 31,008,915
Outstanding exercisable, Number of Shares 58,349,129  
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 0.82 $ 0.88
Outstanding exercisable, Weighted Average Exercise Price $ 0.82  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 8 months 19 days 2 years 11 months 9 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 6 months  
Options and warrants outstanding, Aggregate Intrinsic Value $ 7,645,082 $ 5,538,335
Outstanding exercisable, Aggregate Intrinsic Value $ 7,451,385