Quarterly report pursuant to Section 13 or 15(d)

Private Securities Offerings - Additional Information (Detail)

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Private Securities Offerings - Additional Information (Detail) - USD ($)
 12 Months Ended
May 31, 2017
Aug. 31, 2017
Equity and Equity Units Offering Disclosure [Line Items]    
Common stock, par value $ 0.001 $ 0.001
Private Equity Offering    
Equity and Equity Units Offering Disclosure [Line Items]    
Exercise price of warrants, per share $ 1.00  
Warrant covering common stock shares purchased, percentage 25.00%  
Common stock sold at private equity offering 729,500  
Common stock, par value $ 0.001  
Proceeds from private equity offering $ 729,500  
Term of warrants 5 years  
Private Equity Offering | Warrants    
Equity and Equity Units Offering Disclosure [Line Items]    
Exercise price of warrants, per share $ 1.35  
Warrants to purchase common shares, shares 182,375