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, 2018
May 31, 2018
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 132,385,269  
Granted, Number of Shares 13,546,582  
Exercised, Number of Shares 0  
Forfeited/expired/cancelled, Number of Shares (75,000)  
Options and warrants outstanding, Number of Shares 145,856,851 132,385,269
Outstanding exercisable, Number of Shares 141,382,362  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.80  
Granted, Weighted Average Exercise Price 0.67  
Exercised, Weighted Average Exercise Price 0  
Forfeited/expired/cancelled, Weighted Average Exercise Price 0.65  
Options and warrants outstanding, Weighted Average Exercise Price 0.79 $ 0.80
Outstanding exercisable, Weighted Average Exercise Price $ 0.79  
Options and warrants outstanding, Weighted Average Remaining Contractual Life in Years 3 years 8 months 26 days 3 years 9 months 11 days
Outstanding exercisable, Weighted Average Remaining Contractual Life in Years 3 years 6 months 29 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 1,710,190 $ 3,673
Outstanding exercisable, Aggregate Intrinsic Value $ 1,200,567