Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

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Convertible Instruments - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 14, 2017
Aug. 31, 2017
May 31, 2017
May 31, 2010
Aug. 24, 2017
Jun. 19, 2017
Aug. 24, 2016
Mar. 18, 2016
Mar. 17, 2016
Apr. 30, 2010
Class of Stock [Line Items]                    
Common stock, shares authorized   350,000,000 350,000,000   375,000,000   350,000,000 250,000,000 200,000,000 100,000,000
Common stock, par value   $ 0.001 $ 0.001              
Non-cash debt discount   $ 444,152                
Amortization of debt issuance costs   $ 113,700                
Common Stock                    
Class of Stock [Line Items]                    
Number of common shares issued upon conversion of preferred stock   10                
Conversion price   $ 0.50                
Short-Term Convertible Notes                    
Class of Stock [Line Items]                    
Conversion price     $ 0.75              
Convertible note, aggregate principal   $ 4,890,000 $ 1,150,000              
Convertible note maturity date     Jan. 31, 2018              
Convertible notes, interest rate     7.00%              
Common stock warrants to purchase shares           383,333        
Debt discount   1,222,000 $ 92,000              
Unamortized issuance costs   $ 322,000                
Short-Term Convertible Notes | Minimum                    
Class of Stock [Line Items]                    
Warrant covering common stock shares purchased, percentage 25.00%                  
Exercise price of warrants, per share $ 1.00                  
Short-Term Convertible Notes | Maximum                    
Class of Stock [Line Items]                    
Warrant covering common stock shares purchased, percentage 50.00%                  
Exercise price of warrants, per share $ 1.35                  
Short-Term Convertible Notes | Investor Warrants                    
Class of Stock [Line Items]                    
Exercise price of warrants, per share   $ 1.00 $ 1.00              
Common stock warrants to purchase shares   4,025,656 4,025,656              
Term of warrants   5 years 5 years              
Short-Term Convertible Notes | Detachable Common Stock Warrants                    
Class of Stock [Line Items]                    
Debt discount   $ 1,600,000 $ 92,000.0              
Non-cash debt discount   444,000 $ 0              
Unamortized issuance costs   436,000                
Amortization of debt issuance costs   $ 114,000                
Series B Convertible Preferred Stock                    
Class of Stock [Line Items]                    
Series B Convertible preferred stock, shares issued   92,100 92,100 400,000            
Preferred Stock, Share issuance price       $ 5.00            
Cash proceeds       $ 2,009,000            
Series B Convertible preferred stock, shares outstanding   92,100 92,100              
Constructive dividend to Preferred stock holders   $ 6,000,000                
Liquidation preference on common shares   $ 5.00                
Dividends are payable to preferred stock holders   0.25                
Convertible preferred stock, par value   $ 0.001 $ 0.001 $ 0.001