Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

v3.19.1
Convertible Instruments - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 15, 2019
Jun. 26, 2018
USD ($)
$ / shares
Jan. 31, 2018
USD ($)
$ / shares
shares
Jan. 30, 2019
USD ($)
Nov. 15, 2018
USD ($)
$ / shares
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
May 31, 2019
USD ($)
May 31, 2018
USD ($)
$ / shares
shares
May 31, 2010
USD ($)
$ / shares
shares
Jun. 07, 2018
shares
Aug. 24, 2017
shares
Aug. 23, 2017
shares
Apr. 30, 2010
shares
Class of Stock [Line Items]                                
Common stock, shares authorized | shares           600,000,000   600,000,000     375,000,000   450,000,000 375,000,000 350,000,000 100,000,000
Common stock, par value | $ / shares           $ 0.001   $ 0.001                
Exercise price of warrants, per share | $ / shares                     $ 1.00          
Amortization of debt discount           $ 559,383 $ 493,022 $ 676,917 $ 1,666,017              
Amortization of debt issuance costs           155,435 153,480 175,024 435,609              
Proceeds from sale of common stock and warrant               29,836,826 22,903,710              
Repayment of note               455,000     $ 0          
Interest expense           335,595 70,642 $ 583,842 251,315 $ 0            
Convertible promissory note maturity period               2 years                
Proceeds from convertible promissory note       $ 5,000,000                        
Extinguishment loss           $ 0 $ 0 $ (1,519,603) 0              
Investor Warrants                                
Class of Stock [Line Items]                                
Common stock warrants to purchase shares | shares           5,460,000   5,460,000                
Conversion of Preferred Stock to Common Stock                                
Class of Stock [Line Items]                                
Undeclared dividend               $ 210,000     199,000          
Accrued dividend           $ 421,000   $ 421,000     $ 387,000          
Short-Term Convertible Notes                                
Class of Stock [Line Items]                                
Series B Convertible preferred stock, shares issued | shares                     400,000          
Conversion price | $ / shares                     $ 0.75          
Convertible note, aggregate principal     $ 6,000,000               $ 4,890,000          
Convertible note maturity date     Jan. 31, 2018         Jan. 31, 2018                
Convertible notes, interest rate                     7.00%          
Common stock warrants to purchase shares | shares     7,718,010                          
Exercise price of warrants, per share | $ / shares     $ 0.75                          
Unamortized discount           0   $ 0     $ 0          
Payment obligation against which common stock issued     $ 5,788,500                          
Accrued but unpaid interest     $ 243,000                          
Number of shares to be sold | shares     12,062,728                          
Sale of Stock, Price Per Share | $ / shares     $ 0.50                          
Proceeds from sale of common stock and warrant     $ 6,000,000                          
Repayment of note     $ 259,000         0     250,000          
Interest expense               0 75,000              
Outstanding balance of convertible note including accrued unpaid interest           0   0     5,788,500          
Net carrying value of note           $ 0   $ 0     0          
Short-Term Convertible Notes | Investor Warrants                                
Class of Stock [Line Items]                                
Common stock warrants to purchase shares | shares           4,025,656   4,025,656                
Exercise price of warrants, per share | $ / shares           $ 1.00   $ 1.00                
Term of warrants               5 years                
Short-Term Convertible Notes | Detachable Common Stock Warrants                                
Class of Stock [Line Items]                                
Unamortized discount           $ 4,200,000   $ 4,200,000     1,500,000          
Amortization of debt discount               700,000 1,600,000              
Amortization of debt issuance costs               0 400,000              
Note                                
Class of Stock [Line Items]                                
Convertible notes, interest rate   10.00%                            
Unamortized discount           600,000   600,000                
Amortization of debt discount               118,000 0              
Unamortized issuance costs           100,000   100,000                
Amortization of debt issuance costs               $ 20,000 0              
Number of shares to be sold | shares               1,123,641                
Interest expense               $ 440,000 $ 0              
Convertible promissory note principle amount   $ 5,700,000                            
Proceeds from convertible promissory note   $ 5,000,000                            
Common stock conversion price | $ / shares   $ 0.55     $ 0.55                      
Convertible promissory note maximum redemption amount   $ 350,000     $ 350,000                      
Convertible promissory note redemption description Effective November 15, 2018, the June 2018 Note was amended to allow the Investor to redeem the monthly redemption amount of $350,000 in cash or stock, at the lesser of (i) $0.55, or (ii) the lowest closing bid price of the Company’s common stock during the 20 days prior to the conversion, multiplied by a conversion factor of 85%. The Investor may redeem any portion of the June 2018 Note, at any time after six months from the issue date upon five trading days' notice, subject to a maximum monthly redemption amount of $350,000.                            
Terms of conversion   1.5                            
Convertible note, redeemed amount               455,000                
Outstanding balance of convertible note including accrued unpaid interest           5,400,000   5,400,000                
Extinguishment loss               1,500,000                
Fair value of Note           6,900,000   6,900,000                
Net carrying value of note           $ 5,400,000   $ 5,400,000                
Two Thousand And Nineteen Short Term Convertible Notes [Member]                                
Class of Stock [Line Items]                                
Conversion price | $ / shares           $ 0.50   $ 0.50                
Convertible note, aggregate principal           $ 5,500,000   $ 5,500,000                
Convertible notes, interest rate           10.00%   10.00%                
Exercise price of warrants, per share | $ / shares           $ 0.50   $ 0.50                
Unamortized discount           $ 2,499,776   $ 2,499,776     0          
Unamortized issuance costs           688,401   $ 688,401     0          
Tail fee covering common stock | shares               972,000                
Tail fee cash amount               $ 583,200                
Net carrying value of note           $ 2,271,823   $ 2,271,823     0          
Two Thousand And Nineteen Short Term Convertible Notes [Member] | Investor Warrants                                
Class of Stock [Line Items]                                
Exercise price of warrants, per share | $ / shares           $ 0.30   $ 0.30                
Two Thousand And Nineteen Short Term Convertible Notes [Member] | Detachable Common Stock Warrants                                
Class of Stock [Line Items]                                
Amortization of debt issuance costs               $ 800,000                
Amortization of Debt Issuance Costs and Discounts               $ 3,000,000                
January 2019 Note [Member]                                
Class of Stock [Line Items]                                
Convertible notes, interest rate           10.00%   10.00%                
Common stock warrants to purchase shares | shares           5,000,000   5,000,000                
Exercise price of warrants, per share | $ / shares           $ 0.30   $ 0.30                
Term of warrants               5 years                
Unamortized discount           $ 600,000   $ 600,000                
Unamortized issuance costs           100,000   100,000                
Interest expense               69,000     $ 0          
Convertible promissory note principle amount           $ 5,700,000   5,700,000                
Proceeds from convertible promissory note               $ 5,000,000                
Common stock conversion price | $ / shares               $ 0.50                
Convertible promissory note redemption description               The Investor may redeem any portion of the January 2019 Note, at any time after six months from the issue date upon five trading days' notice, subject to a maximum monthly redemption amount of $350,000. The monthly redemption amount may be paid in cash or stock, at the Company's election, at the lesser of (i) $0.50, or (ii) the lowest closing bid price of the Company's common stock during the 20 days prior to the conversion, multiplied by a conversion factor of 85%.                
Company Reserves Shares For Future Conversition | shares               20,000,000                
Common Stock                                
Class of Stock [Line Items]                                
Number of common shares issued upon conversion of preferred stock | shares           10   10                
Conversion price | $ / shares           $ 0.50   $ 0.50                
Series B Convertible Preferred Stock                                
Class of Stock [Line Items]                                
Series B Convertible preferred stock, shares issued | shares           92,100   92,100     92,100 400,000        
Preferred Stock, Share issuance price | $ / shares           $ 5.00   $ 5.00                
Cash proceeds                       $ 2,009,000        
Series B Convertible preferred stock, shares outstanding | shares           92,100   92,100     92,100          
Constructive dividend to Preferred stock holders               $ 6,000,000                
Liquidation preference on common shares | $ / shares           $ 5.00   $ 5.00                
Dividends are payable to preferred stock holders | $ / shares               0.25                
Convertible preferred stock, par value | $ / shares           $ 0.001   $ 0.001     $ 0.001 $ 0.001