Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Additional Information (Detail)

v3.10.0.1
Stock Options and Warrants - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
May 31, 2018
Jun. 15, 2018
Aug. 24, 2017
Sep. 30, 2016
Mar. 31, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common Stock issued 233,880,390   216,881,790          
Proceeds from Issuance of Common Stock $ 8,990,000              
Inducement interest related to warrant extensions   $ 826,252 $ 800,000          
Compensation expense $ 283,346 254,953            
Placement Agent                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Warrants to purchase common shares, shares       133,600   1,066,667    
Term of warrants       5 years   5 years    
Exercise price of warrants, per share       $ 0.55   $ 0.825    
Investor                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of warrants, per share     $ 0.50          
Common Stock issued     3,295,000          
Proceeds from Issuance of Common Stock     $ 1,600,000          
Before Inducement | Investor                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of warrants, per share     $ 1.00          
Class of warrant or right expiration date     Jun. 30, 2017          
Private Equity Offering                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Warrants to purchase common shares, shares 7,514,300              
Term of warrants 5 years              
Exercise price of warrants, per share $ 0.75              
Proceeds from Issuance of Common Stock $ 6,600,000              
Private Equity Offering | Placement Agent                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Warrants to purchase common shares, shares 1,422,860              
Term of warrants 5 years              
Exercise price of warrants, per share $ 0.50              
Subscription Agreements                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Warrants to purchase common shares, shares       1,970,000        
Term of warrants       5 years        
Exercise price of warrants, per share       $ 0.75        
2012 Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation expense $ 283,000 255,000            
Grant date fair value of options and warrants 692,000 $ 447,000            
Unrecognized compensation expense $ 1,100,000              
Weighted average period over which unrecognized compensation expense is expected to be recognized 1 year 7 months 6 days              
2012 Equity Incentive Plan | Employee Stock Option One | Managing Director                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period 1 year              
Stock options, term 10 years              
2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Range One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares 680,822              
Stock option granted, exerices price $ 0.49              
2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Range Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares 80,822              
Stock option granted, exerices price $ 0.47              
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares 80,822              
Stock option granted, exerices price $ 0.30              
Stock options grant date fair value $ 0.31              
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member] | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual increase stock option granted, shares 75,000              
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member] | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual increase stock option granted, shares 100,000              
2012 Equity Incentive Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for future stock-based grants 2,403,048              
2012 Equity Incentive Plan | Stock Options | Before Amendment                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for future issuance         7,000,000   5,000,000 3,000,000
2012 Equity Incentive Plan | Stock Options | After Amendment                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for future issuance         15,000,000   7,000,000 5,000,000
2012 Equity Incentive Plan | Stock Options | Executive Management and Employees                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares 875,000              
Vesting period 3 years              
Stock options, term 10 years              
Stock options grant date fair value $ 0.31              
Stock options granted, exercise price, lower range limit $ 0.49              
2012 Equity Incentive Plan | Stock Options | Executive Chairman                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares 950,000              
Stock option granted, exerices price $ 0.49              
Vesting period 24 months              
Stock options, term 10 years              
Stock options grant date fair value $ 0.41