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 6 Months Ended 12 Months Ended
Nov. 30, 2017
Oct. 11, 2017
Sep. 08, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Nov. 30, 2017
May 31, 2017
Equity and Equity Units Offering Disclosure [Line Items]                
Common stock, par value $ 0.001           $ 0.001 $ 0.001
Make-Whole Securities                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share $ 0.75           $ 0.75  
Common stock sold at private equity offering 503,015              
Term of warrants 5 years              
Warrants to purchase common shares, shares 251,504           251,504  
Make-Whole Securities | Waiver and Subscription Agreement                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share   $ 0.75 $ 1.00          
Purchase price, per share   0.65 0.75          
Placement Agent                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share $ 0.825 $ 0.715 $ 0.825 $ 0.825 $ 0.825 $ 0.825 $ 0.825  
Term of warrants   5 years 5 years 5 years 5 years 5 years 5 years  
Warrants to purchase common shares, shares 350,766 150,461 213,573 453,652 122,799 1,066,667 350,766  
Placement Agent | Make-Whole Securities                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share $ 0.715           $ 0.715  
Term of warrants 5 years              
Warrants to purchase common shares, shares 26,702           26,702  
Placement Agent | Make-Whole Securities | Waiver and Subscription Agreement                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share   $ 0.715 $ 0.825          
Private Equity Offering                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share $ 0.75           $ 0.75 $ 1.00
Warrant covering common stock shares purchased, percentage             100.00% 25.00%
Common stock sold at private equity offering             6,651,800 729,500
Common stock, par value               $ 0.001
Proceeds from private equity offering             $ 3,325,900 $ 729,500
Term of warrants             5 years 5 years
Warrants to purchase common shares, shares 6,651,800           6,651,800  
Purchase price, per share $ 0.50           $ 0.50  
Private Equity Offering | Placement Agent                
Equity and Equity Units Offering Disclosure [Line Items]                
Exercise price of warrants, per share $ 0.55           $ 0.55  
Term of warrants             5 years  
Warrants to purchase common shares, shares 452,180           452,180  
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