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 ($)
 1 Months Ended 3 Months Ended
Jun. 15, 2018
Sep. 30, 2016
Aug. 31, 2018
May 31, 2018
Equity and Equity Units Offering Disclosure [Line Items]        
Common stock, par value     $ 0.001 $ 0.001
Proceeds from issuance of common shares     $ 8,990,000  
Placement Agent        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share $ 0.55 $ 0.825    
Warrants to purchase common shares, shares 133,600 1,066,667    
Percentage of shares, issued as warrants 8.00% 8.00%    
Term of warrants 5 years 5 years    
Private Equity Offering        
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%  
Common stock sold at private equity offering     15,028,600  
Common stock, par value     $ 0.001  
Proceeds from private equity offering     $ 7,500,000  
Term of warrants     5 years  
Warrants to purchase common shares, shares     7,514,300  
Proceeds from issuance of common shares     $ 6,600,000  
Term of warrants     5 years  
Private Equity Offering | Placement Agent        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share     $ 0.50  
Warrants to purchase common shares, shares     1,422,860  
Percentage of shares, issued as warrants     10.00%  
Term of warrants     5 years  
Private Equity Offering | Warrants        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share     $ 0.75  
Warrants to purchase common shares, shares     7,514,300