Quarterly report pursuant to Section 13 or 15(d)

Equity Awards - Private Placement of Shares of Common Stock and Warrants (Details)

v3.22.2.2
Equity Awards - Private Placement of Shares of Common Stock and Warrants (Details) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2022
Aug. 30, 2022
Feb. 14, 2022
Aug. 31, 2022
Jun. 30, 2022
Aug. 31, 2021
May 31, 2022
Jul. 18, 2022
Jul. 17, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share $ 0.255 $ 0.40   $ 0.255          
Loss on derivatives       $ (8,601,000)          
Warrant exercises (in shares)       500,000          
Warrant exercises       $ 264,000   $ 503,000 [1]      
Exercise of warrants for cash       $ 300,000          
Cashless exercise of warrants, shares       200,000          
Cashless exercise of warrants, warrants       300,000          
Shares issued during the period new issues shares       4,600,000          
Change of fair value of liability-classified equity instrument upon reclassification       $ 8,601,000          
Common stock warrants to purchase shares 5,500,000     5,500,000          
Proceeds from warrant exercises       $ 264,000   503,000 [2]      
Proceeds from warrant transactions, net of offering costs [2]           775,000      
Warrant covering common stock shares purchased, percentage 75.00% 50.00%              
Placement agent fees and expenses         $ 2,800,000        
Incremental fair value of warrants       $ 4,200,000          
Former CEO                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation policy period             18 months    
Shares issued during the period new issues shares       88,983          
Former General Counsel                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation policy period             12 months    
Shares issued during the period new issues shares       79,391          
Private Equity Offering                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock issued for private offerings       $ 17,544,000   2,872,000 [1]      
Accredited Investors                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares issued during the period new issues shares         85,400,000        
Stock issued for private offerings         $ 18,900,000        
Proceeds, net of issuance costs         $ 7,700,000        
Private Warrant Exchange [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant exercises [1]           775,000      
Allotment to placement agent                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share   $ 0.40     $ 0.255        
Common stock warrants to purchase shares         19,400,000        
Term of warrants         10 years        
Warrant covering common stock shares purchased, percentage         13.00%        
Placement agent fees and expenses         $ 50,000        
Second Private Placement                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share         $ 0.306        
Exercise price of stock warrant combo, per share         $ 0.255        
Shares issued during the period new issues shares             34,600,000    
Common stock warrants to purchase shares         64,000,000.0        
Term of warrants         5 years        
Number of common shares in a fixed combination issue of shares         1        
Number Of Warrants In Fixed Combination Issue Of Securities         1        
Warrant exercise price percentage of final unit price         120.00%        
Surety Bond Backstop Agreement                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock based compensation       $ 5,300,000   $ 0      
Interest rate     10.00%            
Period of Indemnification, Payment by Indemnitors     90 days            
Indemnification Fee Payment Ratio     1.50%            
Initial Warrant                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock warrants to purchase shares     15,000,000            
Make-Whole Warrant                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock warrants to purchase shares     15,000,000            
Four Good Warrants                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share               $ 0.20 $ 0.30
Change of fair value of liability-classified equity instrument upon reclassification             $ 6,600,000    
Term of warrants               5 years  
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share $ 0.75     $ 0.75          
Warrant covering common stock shares purchased, percentage       0.50%          
Maximum | Allotment to placement agent                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share 0.255     $ 0.255          
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of warrants, per share 0.45     0.45          
Cashless exercise of warrants, exercise price $ 0.40     $ 0.40          
[1] See Note 2, Summary of Significant Accounting Policies.
[2] See Note 2, Summary of Significant Accounting Policies.