Quarterly report pursuant to Section 13 or 15(d)

Registered Direct Equity Offerings - Additional Information (Detail)

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Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 15, 2018
Feb. 01, 2018
Jan. 31, 2018
Jan. 30, 2018
Sep. 30, 2016
Aug. 31, 2018
May 31, 2018
Stockholders Equity Note [Line Items]              
Proceeds from issuance of common shares           $ 8,990,000  
Warrants issued included in closing costs           1,066,667  
Fair value of placement agent warrants           $ 819,200  
Proceeds allocated to financing expense           241,986  
Issuance cost incurred           577,214  
Gross proceeds from issuance of common stock           8,499,300  
Long-term debt and capital lease obligations including current maturities           $ 5,700,000  
Investor              
Stockholders Equity Note [Line Items]              
Class of warrants, exercise price             $ 0.50
Proceeds from issuance of common shares             $ 1,600,000
Short-Term Convertible Notes              
Stockholders Equity Note [Line Items]              
Purchase price, per share     $ 0.50        
Warrants to purchase common shares, shares     7,718,010        
Class of warrants, exercise price     $ 0.75        
Term of warrants     5 years        
Number of shares to be sold     12,062,728        
Gross proceeds from issuance of common stock     $ 6,000,000        
Debt Instrument, maturity date     Jan. 31, 2018       Jan. 31, 2018
Debt Instrument, face amount     $ 6,000,000       $ 4,890,000
Debt Instrument, accrued interest     300,000        
Long-term debt and capital lease obligations including current maturities     6,300,000       6,038,500
Stock repurchased during period, value     $ 259,000       $ 250,000
Percentage of warrants coverage   100.00% 50.00%        
Conversion of stock       $ 0.75      
Reinvestment of the principal amount per share     $ 0.50        
2013 Convertible Notes | Investor | Detachable Common Stock Warrants              
Stockholders Equity Note [Line Items]              
Inducement interest related to convertible notes     $ 2,400,000        
2013 Convertible Notes | Investor | Detachable Common Stock Warrants | Minimum              
Stockholders Equity Note [Line Items]              
Class of warrants, exercise price     $ 0.75        
2013 Convertible Notes | Investor | Detachable Common Stock Warrants | Maximum              
Stockholders Equity Note [Line Items]              
Class of warrants, exercise price     $ 1.00        
Placement Agent              
Stockholders Equity Note [Line Items]              
Warrants to purchase common shares, shares 133,600       1,066,667    
Class of warrants, exercise price $ 0.55       $ 0.825    
Term of warrants 5 years       5 years    
Percentage of shares, issued as warrants 8.00%       8.00%    
Placement Agent | Short-Term Convertible Notes              
Stockholders Equity Note [Line Items]              
Cash commission paid     $ 164,425        
Securities Purchase Agreement              
Stockholders Equity Note [Line Items]              
Number of shares to be sold         13,333,334    
Purchase price, per share         $ 0.75    
Warrants to purchase common shares, shares         6,666,667    
Class of warrants, exercise price         $ 1.00    
Term of warrants         5 years    
Proceeds from issuance of common shares         $ 9,000,000    
Placement agent's fees, as a percentage of gross proceeds         8.00%    
Subscription Agreements              
Stockholders Equity Note [Line Items]              
Number of shares to be sold 1,970,000            
Purchase price, per share $ 0.50            
Warrants to purchase common shares, shares 1,970,000            
Class of warrants, exercise price $ 0.75            
Term of warrants 5 years            
Proceeds from issuance of common shares $ 900,000