Quarterly report pursuant to Section 13 or 15(d)

Private Securities Offering - Additional Information (Detail)

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Private Securities Offering - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2016
May 31, 2016
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 48,659,338
Common stock, par value $ 0.001 $ 0.001
Term of warrants 5 years 5 years
Warrants to purchase common shares, shares 774,097  
Proceeds from private equity offering $ 729,500 $ 37,600,000
Private Equity Offering | Minimum    
Equity and Equity Units Offering Disclosure [Line Items]    
Exercise price of warrants, per share   $ 0.75
Warrant covering common stock shares purchased, percentage   50.00%
Private Equity Offering | Maximum    
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%
Private Equity Offering | Placement Agent    
Equity and Equity Units Offering Disclosure [Line Items]    
Warrants to purchase common shares, shares   4,960,314
Aggregate cash fee   $ 3,900,000
Vested restricted stock awards   2,700,000
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 23,254,230