Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Stock options (Details)

v3.23.1
Equity Awards and Warrants - Stock options (Details) - $ / shares
shares in Thousands
9 Months Ended 12 Months Ended
Feb. 28, 2023
Feb. 28, 2022
May 31, 2022
Additional Information      
Award vesting period 4 years    
Stock options grant date fair value $ 0.34 $ 1.09  
Tranche One [Member]      
Additional Information      
Stock option vested, Shares 10,900    
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 17,457    
Granted 12,417    
Forfeited, expired, and cancelled (7,783)    
Outstanding, end of period 22,091   17,457
Options exercisable (in shares) 12,698    
Weighted average exercise price      
Outstanding at the beginning of the year (in dollars per share) $ 1.53    
Granted 0.41    
Forfeited, expired, and cancelled 1.16    
Outstanding at the end of the year (in dollars per share) 1.02   $ 1.53
Options outstanding and exercisable $ 1.28    
Additional Information      
Weighted average remaining contractual life in years 8 years 1 month 13 days   7 years 9 months 14 days
Weighted average remaining contractual life in years exercisable 7 years 1 month 24 days    
Stock option granted, Shares 12,400 11,300  
Award vesting period     3 years