Quarterly report pursuant to Section 13 or 15(d)

Registered Direct Equity Offerings - Additional Information (Detail)

v3.19.1
Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2018
Feb. 01, 2018
Jan. 31, 2018
Jan. 30, 2018
Feb. 13, 2019
Feb. 28, 2019
Feb. 28, 2018
May 31, 2018
Stockholders Equity Note [Line Items]                
Class of warrants, exercise price               $ 1.00
Gross proceeds from issuance of common stock           $ 29,836,826 $ 22,903,710  
Long-term debt and capital lease obligations including current maturities           $ 5,425,416   $ 0
Investor                
Stockholders Equity Note [Line Items]                
Warrants to purchase common shares, shares           5,000,000    
Class of warrants, exercise price           $ 0.30   $ 0.50
Term of warrants           5 years    
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     $ 0   $ 6,038,500
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 | Detachable Common Stock Warrants | Maximum                
Stockholders Equity Note [Line Items]                
Class of warrants, exercise price     $ 1.00          
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          
Placement Agent                
Stockholders Equity Note [Line Items]                
Warrants to purchase common shares, shares 133,600       965,563      
Class of warrants, exercise price $ 0.55       $ 0.50 $ 0.50    
Term of warrants 5 years              
Percentage of shares, issued as warrants 8.00%       9.00%      
Placement Agent | Short-Term Convertible Notes                
Stockholders Equity Note [Line Items]                
Cash commission paid     $ 164,425          
Subscription Agreements                
Stockholders Equity Note [Line Items]                
Number of shares to be sold 1,970,000       10,728,480      
Purchase price, per share $ 0.50       $ 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              
2019 Subscription Agreement                
Stockholders Equity Note [Line Items]                
Warrants to purchase common shares, shares         5,364,240      
Class of warrants, exercise price         $ 0.50      
Term of warrants         5 years      
Proceeds from issuance of common shares         $ 4,800,000