Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

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Stock Options and Warrants (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Feb. 28, 2017
May 31, 2016
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 63,307,150  
Granted, Number of Shares 16,544,981  
Exercised, Number of Shares (912,862)  
Forfeited/expired/cancelled, Number of Shares (1,430,000)  
Options and warrants outstanding, Number of Shares 77,509,269 63,307,150
Outstanding exercisable, Number of Shares 73,831,019  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.83  
Granted, Weighted Average Exercise Price 0.98  
Exercised, Weighted Average Exercise Price 0.55  
Forfeited/expired/cancelled, Weighted Average Exercise Price 1.57  
Options and warrants outstanding, Weighted Average Exercise Price 0.86 $ 0.83
Outstanding exercisable, Weighted Average Exercise Price $ 0.85  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 7 months 24 days 3 years 2 months 12 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 4 months 24 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 167,000 $ 9,863,492
Outstanding exercisable, Aggregate Intrinsic Value $ 157,146