Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

v3.20.4
Convertible Instruments - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2020
Nov. 10, 2020
Jul. 30, 2020
Jul. 29, 2020
Jul. 27, 2020
Jan. 28, 2020
Jun. 26, 2018
Jan. 30, 2019
Nov. 15, 2018
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
May 31, 2020
Jul. 31, 2020
Sep. 30, 2019
Class of Stock [Line Items]                                
Common stock, par value $ 0.001                 $ 0.001   $ 0.001   $ 0.001    
Convertible notes, interest rate 10.00%                 10.00%   10.00%        
Exercise price of warrants, per share                     $ 0.45   $ 0.45      
Amortization of debt discount                   $ 1,243,000 $ 439,000 $ 2,582,000 $ 1,470,000      
Proceeds from sale of common stock and warrant                       1,000,000 6,665,000      
Proceeds from convertible promissory note               $ 5,000,000                
Common stock conversion price             $ 0.55       $ 0.50          
Convertible promissory note maximum redemption amount                       950,000        
Convertible note, redeemed amount                       4,500,000        
Outstanding balance of convertible note including accrued unpaid interest         $ 9,500,000                      
Extinguishment loss                       (4,169,000)        
Accrued dividends $ 1,816,000                 $ 1,816,000   $ 1,816,000   $ 981,000    
Common Stock, Shares, Issued 590,279,000                 590,279,000   590,279,000   519,261,000    
Interest paid                       $ 138,000 255,000      
Preferred stock, par value $ 0.001                 $ 0.001   $ 0.001   $ 0.001    
Gain loss on extinguishment of debt                       $ (4,169,000)        
Accrued interest on convertible notes $ 1,133,000                 $ 1,133,000   1,133,000   $ 292,000    
Outstanding balance of convertible note including accrued unpaid interest         $ 9,500,000                      
Conversion Of Debt Into Equity [Member]                                
Class of Stock [Line Items]                                
Amortization of debt discount                   $ 700,000   $ 1,900,000        
Interest Rate Payable On Default [Member]                                
Class of Stock [Line Items]                                
Convertible notes, interest rate 10.00%                 10.00%   10.00%        
Debt Instrument, Interest Rate, Basis for Effective Rate 22                              
Default Percentage One [Member]                                
Class of Stock [Line Items]                                
Debt instrument percentage increase on principal payable on default                       15.00%        
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul 15.00%                 15.00%   15.00%        
Default Percentage Two [Member]                                
Class of Stock [Line Items]                                
Debt instrument percentage increase on principal payable on default                       10.00%        
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul 10.00%                 10.00%   10.00%        
Default Percentage Three [Member]                                
Class of Stock [Line Items]                                
Debt instrument percentage increase on principal payable on default                       5.00%        
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul 5.00%                 5.00%   5.00%        
Conversion of Preferred Stock to Common Stock                                
Class of Stock [Line Items]                                
Undeclared dividend                       $ 7,700 200,000      
Accrued dividend $ 15,400                 $ 15,400 $ 500,000 15,400 500,000      
Note                                
Class of Stock [Line Items]                                
Convertible notes, interest rate             10.00%                  
Number of shares to be sold                           8,500,000    
Convertible promissory note principle amount             $ 5,700,000                  
Proceeds from convertible promissory note             $ 5,000,000.0                  
Common stock conversion price             $ 0.55                  
Convertible promissory note maximum redemption amount                 $ 300,000              
Convertible promissory note redemption description             The June 2018 Note provided for conversion in total, or in part, of the outstanding balance, into common stock of the Company at any time after six months from the issue date upon five trading days’ notice, subject to certain adjustments and ownership limitations specified in the June 2018 Note, and allowed for redemption, at any time after six months from the issue date upon five trading days’ notice, subject to maximum monthly redemption amount of $0.35 million.   Effective November 15, 2018, the June 2018 Note was amended to allow the investor to redeem the monthly redemption amount of $0.35 million 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%.              
Extinguishment loss                       1,500,000        
Fair value of Note 6,900,000                 6,900,000   6,900,000        
Net carrying value of note 5,400,000                 $ 5,400,000   $ 5,400,000        
Interest paid             $ 500,000                  
Number of days of notice to be given by the investor to the company for redemption                       3 days        
Debt instrument number of days of notice to be given by the company to the investor for prepayment                       1 day        
Number of days of notice to be given for conversion of notes into common stock                       5 days        
Debt instrument term                   2 years            
Gain loss on extinguishment of debt                       $ 1,500,000        
Note | Default Percentage Three [Member]                                
Class of Stock [Line Items]                                
Debt instrument percentage increase on principal payable on default                       5.00%        
2019 Short Term Convertible Notes                                
Class of Stock [Line Items]                                
Convertible note, aggregate principal $ 5,500,000                 $ 5,500,000 200,000 $ 5,500,000 200,000     $ 200,000
Repayment of note                     700,000          
Interest expense                         $ 300,000      
Common stock conversion price                           $ 0.50    
Outstanding balance of convertible note including accrued unpaid interest                           $ 5,200,000    
Debt outstanding amount                               5,900,000
Noncash inducement interest expense                     $ 300,000          
Common Stock, Shares, Issued                           10,400,000    
Outstanding balance of convertible note including accrued unpaid interest                           $ 5,200,000    
2019 Short Term Convertible Notes | Tranche One [Member]                                
Class of Stock [Line Items]                                
Debt outstanding amount                               1,100,000
2019 Short Term Convertible Notes | Tranche Two [Member]                                
Class of Stock [Line Items]                                
Debt outstanding amount                               $ 4,100,000
January 2019 Note [Member]                                
Class of Stock [Line Items]                                
Convertible notes, interest rate 10.00%                 10.00%   10.00%        
Common stock warrants to purchase shares 5,000,000.0                 5,000,000.0   5,000,000.0        
Exercise price of warrants, per share $ 0.30                 $ 0.30 $ 0.30 $ 0.30 $ 0.30      
Term of warrants                       5 years        
Unamortized discount $ 600,000                 $ 600,000   $ 600,000   $ 6,300,000    
Unamortized issuance costs 100,000                 $ 100,000   100,000        
Number of shares to be sold                   10,800,000            
Interest expense                         $ 400,000      
Convertible promissory note principle amount               $ 5,700,000                
Proceeds from convertible promissory note                       $ 5,000,000.0        
Common stock conversion price                       $ 0.50        
Convertible promissory note redemption description                       The January 2019 Note provided the investor with the right to 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 $0.35 million. 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                       20,000,000        
Interest paid                   $ 850,000            
Convertible Promissory Notes [Member]                                
Class of Stock [Line Items]                                
Convertible note, aggregate principal $ 17,100,000                 $ 17,100,000   $ 17,100,000        
Common stock warrants to purchase shares                     4,750,000   4,750,000      
Amortization of debt discount                       2,100,000        
Proceeds from sale of common stock and warrant                       $ 15,000,000.0        
Common stock conversion price         $ 4.50             $ 4.50        
Shares issued on conversion         2,100,000             2,100,000        
March 2020 Long Term Convertible Notes [Member]                                
Class of Stock [Line Items]                                
Common stock, par value $ 0.001                 $ 0.001   $ 0.001        
Amortization of debt discount                       $ 600,000        
Repayment of note                   $ 4,300,000            
Convertible note, redeemed amount                       950,000        
Extinguishment loss                       4,200,000        
Interest paid                   950,000            
Debt instrument prepayment amout payable   $ 7,500,000                            
Gain loss on extinguishment of debt                       $ 4,200,000        
July 2020 Long Term Convertible Notes [Member]                                
Class of Stock [Line Items]                                
Convertible notes, interest rate       10.00%                        
Convertible promissory note principle amount   28,500,000   $ 28,500,000                        
Proceeds from convertible promissory note   25,000,000.0   25,000,000.0                        
Common stock conversion price                       $ 10.00        
Convertible promissory note maximum redemption amount                       $ 1,600,000        
Outstanding balance of convertible note including accrued unpaid interest $ 29,500,000                 29,500,000   29,500,000        
Amortisation of debt issuance costs and discount                   400,000   600,000        
Unamortised discount and debt issuance costs $ 2,900,000                 $ 2,900,000   $ 2,900,000        
Debt instrument lock in period                       6 months        
Debt instrument prepayment percentage premium                       15.00%        
Discount on Convertible Promissory Note       3,400,000                        
Expense Payable On Issuance Of Convertible Promissory Note       $ 100,000                        
Common stock shares reserved for future issuance 6,000,000.0                 6,000,000.0   6,000,000.0        
Debt insturument number of shares to be registered so that they are issued upon conversion                             2.9  
Accrued interest on convertible notes $ 1,000,000.0                 $ 1,000,000.0   $ 1,000,000.0        
Outstanding balance of convertible note including accrued unpaid interest $ 29,500,000                 $ 29,500,000   29,500,000        
July 2020 Long Term Convertible Notes [Member] | Maximum                                
Class of Stock [Line Items]                                
Proceeds from sale of common stock and warrant                       $ 25,000,000.0        
Long Term Secured Convertible Notes 2020 [Member] | Securities Purchase Agreement                                
Class of Stock [Line Items]                                
Debt instrument prepayment amout payable   $ 7,500,000                            
Common Stock, Capital Shares Reserved for Future Issuance   6,000,000.0                            
November 2020 Long Term Convertible Notes [Member]                                
Class of Stock [Line Items]                                
Convertible notes, interest rate 10.00%                 10.00%   10.00%        
Interest expense                   $ 100,000   $ 100,000        
Common stock conversion price                       $ 10.00        
Convertible promissory note maximum redemption amount                       $ 3,500,000        
Outstanding balance of convertible note including accrued unpaid interest $ 28,600,000                 28,600,000   28,600,000        
Amortisation of debt issuance costs and discount                       100,000        
Unamortised discount and debt issuance costs 3,400,000                 3,400,000   $ 3,400,000        
Number of days of notice to be given by the investor to the company for redemption                       3 days        
Number of days of notice to be given for conversion of notes into common stock                       5 days        
Discount on Convertible Promissory Note 3,400,000                 3,400,000   $ 3,400,000        
Expense Payable On Issuance Of Convertible Promissory Note 100,000                 100,000   100,000        
Accrued interest on convertible notes 100,000                 100,000   100,000        
Outstanding balance of convertible note including accrued unpaid interest $ 28,600,000                 $ 28,600,000   $ 28,600,000        
Common Stock                                
Class of Stock [Line Items]                                
Conversion price $ 0.50                 $ 0.50   $ 0.50        
Series B Convertible Preferred Stock                                
Class of Stock [Line Items]                                
Preferred stock, shares outstanding 87,000                 87,000   87,000   92,000    
Liquidation preference on common shares $ 5.00                 $ 5.00   $ 5.00        
Dividends are payable to preferred stock holders                       0.25        
Preferred stock date of dividend declaration     Jul. 30, 2020                          
Preferred stock cash dividend declared     $ 200,000                          
Preferred stock, par value $ 0.001                 $ 0.001   $ 0.001   $ 0.001    
Temporary equity shares authorised 400,000                 400,000   400,000        
Series B Convertible Preferred Stock | Common Stock                                
Class of Stock [Line Items]                                
Preferred stock, shares outstanding 87,100                 87,100   87,100        
Series C Convertible Preferred Stock                                
Class of Stock [Line Items]                                
Preferred Stock, Share issuance price $ 1,000                 $ 1,000   $ 1,000        
Preferred stock, shares outstanding 8,000                 8,000   8,000   8,000    
Preferred Stock, Dividend Rate, Percentage                       (10.00%)        
Convertible Preferred Stock Conversion Price $ 0.50                 $ 0.50   $ 0.50        
Accrued dividends $ 1,100,000                 $ 1,100,000   $ 1,100,000   $ 700,000    
Accrued dividend Shares 2,200,000                 2,200,000   2,200,000   1,400,000    
Preferred stock, par value $ 0.001                 $ 0.001   $ 0.001   $ 0.001    
Temporary equity shares authorised 8,203                 8,203   8,203        
Series C Convertible Preferred Stock | Common Stock                                
Class of Stock [Line Items]                                
Preferred stock, shares outstanding 8,203                 8,203   8,203        
Series D Convertible Preferred Stock                                
Class of Stock [Line Items]                                
Preferred Stock, Share issuance price $ 1,000.00                 $ 1,000.00   $ 1,000.00        
Preferred stock, shares outstanding 9,000                 9,000   9,000   9,000    
Dividends are payable to preferred stock holders           $ 0.50                    
Preferred Stock, Dividend Rate, Percentage           (10.00%)                    
Convertible Preferred Stock Conversion Price $ 0.80                 $ 0.80   $ 0.80        
Accrued dividends $ 700,000                 $ 700,000   $ 700,000   $ 300,000    
Accrued dividend Shares 1,400,000                 1,400,000   1,400,000   500,000    
Preferred stock, par value $ 0.001                 $ 0.001   $ 0.001   $ 0.001    
Temporary equity shares authorised 11,737                 11,737   11,737        
Series D Convertible Preferred Stock | Common Stock                                
Class of Stock [Line Items]                                
Preferred stock, shares outstanding 8,452                 8,452   8,452