Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Stock options (Details)

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Equity Awards and Warrants - Stock options (Details) - USD ($)
$ / shares in Units, shares in Thousands
9 Months Ended 12 Months Ended
Feb. 29, 2024
Feb. 28, 2023
May 31, 2023
Additional Information      
Stock options grant date fair value $ 0.17 $ 0.34  
Tranche One [Member]      
Additional Information      
Stock option vested, Shares   10,900  
Award vesting period   4 years  
Tranche Two [Member]      
Additional Information      
Stock option vested, Shares   1,100  
Award vesting period   1 year  
Tranche Three      
Additional Information      
Stock option vested, Shares   400  
Stock Options      
Number of shares      
Outstanding, beginning of period 19,823    
Granted 11,251    
Forfeited, expired, and cancelled (8,124)    
Outstanding, end of period 22,950   19,823
Options exercisable (in shares) 18,376    
Weighted average exercise price      
Outstanding at the beginning of the year (in dollars per share) $ 0.99    
Granted 0.21    
Forfeited, expired, and cancelled 0.88    
Outstanding at the end of the year (in dollars per share) 0.65   $ 0.99
Options outstanding and exercisable $ 0.74    
Additional Information      
Weighted average remaining contractual life in years 7 years 9 months 7 days   7 years 10 months 13 days
Weighted average remaining contractual life in years exercisable 7 years 4 months 13 days    
Options and warrants outstanding, Aggregate Intrinsic Value $ 504,000    
Options and warrants outstanding and exercisable, Aggregate Intrinsic Value $ 335,000    
Stock option granted, Shares 11,300 12,400  
Stock Options | Tranche One [Member]      
Additional Information      
Stock option vested, Shares 4,100    
Stock Options | Tranche Two [Member]      
Additional Information      
Stock option vested, Shares 4,000    
Award vesting period 1 year    
Stock Options | Tranche Three      
Additional Information      
Stock option vested, Shares 2,700    
Award vesting period 4 years    
Stock Options | Tranche Four      
Additional Information      
Stock option vested, Shares 500