Annual report pursuant to Section 13 and 15(d)

Private Securities Offerings - Additional Information (Detail)

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Private Securities Offerings - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 23, 2018
Nov. 30, 2017
May 31, 2018
May 31, 2017
May 31, 2016
May 22, 2018
Jan. 23, 2018
Nov. 24, 2017
Oct. 11, 2017
Sep. 08, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Equity and Equity Units Offering Disclosure [Line Items]                            
Common stock, par value     $ 0.001 $ 0.001                    
Warrants to purchase common shares, shares 3,027,263                          
Common stock issued     $ 104,546                      
Offer to Amend and Exercise                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Exercise price of warrants, per share               $ 0.50            
Warrants to purchase common shares, shares               51,090,113            
Offer to Amend and Exercise | Minimum                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Exercise price of warrants, per share               $ 0.50            
Offer to Amend and Exercise | Maximum                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Exercise price of warrants, per share               1.35            
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                        
Warrants to purchase common shares, shares   251,504                        
Term of warrants   5 years                        
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 $ 0.55   $ 0.715 $ 0.825 $ 0.825 $ 0.825 $ 0.825  
Warrants to purchase common shares, shares           315,200 245,681   150,461 213,573 453,652 122,799 1,066,667  
Term of warrants           5 years 5 years   5 years 5 years 5 years 5 years 5 years  
Placement Agent | Make-Whole Securities                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Exercise price of warrants, per share   $ 0.715               $ 0.715        
Warrants to purchase common shares, shares   26,702 26,702                      
Term of warrants   5 years                        
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                   $ 1.35
Warrant covering common stock shares purchased, percentage     100.00% 25.00%                    
Common stock sold at private equity offering     35,286,904 729,500 48,659,338                  
Common stock, par value       $ 0.001 $ 0.001                  
Proceeds from private equity offering     $ 17,600,000 $ 729,500 $ 37,600,000                  
Term of warrants         5 years                  
Warrants to purchase common shares, shares     35,286,904                     182,375
Term of warrants     5 years 5 years                   5 years
Purchase price, per share     $ 0.50                      
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 | Offer to Amend and Exercise                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Exercise price of warrants, 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 $ 0.825                    
Warrants to purchase common shares, shares     2,813,491 576,451 4,960,314                  
Aggregate cash fee         $ 3,900,000                  
Vested restricted stock awards         2,700,000                  
Term of warrants     5 years 5 years                    
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                  
Common Stock                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Common stock sold at private equity offering     310,526                      
Common stock issued     $ 311                      
Common Stock | Private Equity Offering | Warrant Holders [Member] | Offer to Amend and Exercise                            
Equity and Equity Units Offering Disclosure [Line Items]                            
Common stock issued $ 2,470,585