Quarterly report pursuant to Section 13 or 15(d)

Private Equity Offerings - Additional Information (Detail)

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Private Equity Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 23, 2018
Nov. 30, 2017
Oct. 11, 2017
Sep. 08, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Feb. 28, 2018
May 31, 2017
Equity and Equity Units Offering Disclosure [Line Items]                  
Common stock, par value               $ 0.001 $ 0.001
Make-Whole Securities                  
Equity and Equity Units Offering Disclosure [Line Items]                  
Exercise price of warrants, per share   $ 0.75              
Common stock sold at private equity offering   503,015              
Term of warrants   5 years              
Warrants to purchase common shares, shares   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 $ 0.55   $ 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 5 years  
Warrants to purchase common shares, shares 245,681   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 $ 1.00
Warrant covering common stock shares purchased, percentage               100.00% 25.00%
Common stock sold at private equity offering               35,286,904 729,500
Common stock, par value                 $ 0.001
Proceeds from private equity offering               $ 17,600,000 $ 729,500
Term of warrants               5 years 5 years
Warrants to purchase common shares, shares               35,286,904  
Purchase price, per share               $ 0.50  
Private Equity Offering | Placement Agent                  
Equity and Equity Units Offering Disclosure [Line Items]                  
Exercise price of warrants, per share               $ 0.55  
Term of warrants               5 years  
Warrants to purchase common shares, shares               2,813,491  
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