Annual report pursuant to Section 13 and 15(d)

Private Securities Offering - Additional Information (Detail)

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Private Securities Offering - Additional Information (Detail) - Entity [Domain] - USD ($)
2 Months Ended 12 Months Ended
Oct. 23, 2013
May. 31, 2013
May. 31, 2015
May. 31, 2014
Feb. 06, 2015
Sep. 26, 2014
Equity and Equity Units Offering Disclosure [Line Items]            
Warrant exercise price   $ 0.75 $ 0.50      
Convertible notes term   6 months   6 months    
Convertible notes   $ 3,981,050 $ 4,862,257   $ 1,500,000 $ 2,000,000
Convertible note conversion price per share   $ 0.75   $ 0.65    
Convertible notes, interest rate   7.00%   5.00%    
Term of warrants   5 years 5 years      
Private Equity Offering            
Equity and Equity Units Offering Disclosure [Line Items]            
Units sold at private equity offering 11,153,850          
Price per unit $ 1.30          
Proceeds from units sold at private equity offering $ 14,500,000          
Number of common stock per unit 2          
Number of shares issued     20,989,494      
Warrant to purchase common share 1          
Warrant exercise price $ 0.75   $ 0.75      
Number of common stock warrants issued     11,153,850