Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.10.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Oct. 04, 2018
Aug. 31, 2018
Jun. 15, 2018
May 31, 2018
Sep. 30, 2016
Subsequent Event [Line Items]          
Common stock, par value   $ 0.001   $ 0.001  
Placement Agent          
Subsequent Event [Line Items]          
Exercise price of warrants, per share     $ 0.55   $ 0.825
Term of warrants     5 years   5 years
Warrants to purchase common shares, shares     133,600   1,066,667
Private Equity Offering          
Subsequent Event [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      
Private Equity Offering | Warrants          
Subsequent Event [Line Items]          
Exercise price of warrants, per share   $ 0.75      
Warrants to purchase common shares, shares   7,514,300      
Private Equity Offering | Placement Agent          
Subsequent Event [Line Items]          
Exercise price of warrants, per share   $ 0.50      
Term of warrants   5 years      
Warrants to purchase common shares, shares   1,422,860      
Private Equity Offering | Subsequent Event          
Subsequent Event [Line Items]          
Exercise price of warrants, per share $ 0.50        
Warrant covering common stock shares purchased, percentage 50.00%        
Common stock sold at private equity offering 22,661,570        
Common stock, par value $ 0.001        
Proceeds from private equity offering $ 11,300,000        
Term of warrants 5 years        
Private Equity Offering | Subsequent Event | Warrants          
Subsequent Event [Line Items]          
Exercise price of warrants, per share $ 0.75        
Warrants to purchase common shares, shares 11,330,785        
Private Equity Offering | Subsequent Event | Placement Agent          
Subsequent Event [Line Items]          
Exercise price of warrants, per share $ 0.50        
Term of warrants 5 years        
Warrants to purchase common shares, shares 2,174,157        
Aggregate cash fee $ 1,300,000        
Payment of one-time non-accountable expense fee $ 25,000