Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plan - Stock options (Details)

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Equity Incentive Plan - Stock options (Details) - Employee Stock Option [Member] - $ / shares
shares in Thousands
 12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Number of shares      
Outstanding, beginning of period 19,823 17,457  
Granted 14,251 12,417  
Forfeited, expired, and cancelled (8,225) (10,051)  
Outstanding, end of period 25,849 19,823 17,457
Options exercisable (in shares) 19,679    
Weighted average exercise price      
Outstanding at the beginning of the year (in dollars per share) $ 0.99 $ 1.53  
Granted 0.21 0.41  
Forfeited, expired, and cancelled 0.87 1.16  
Outstanding at the end of the year (in dollars per share) 0.60 $ 0.99 $ 1.53
Options outstanding and exercisable $ 0.71    
Additional Information      
Weighted average remaining contractual life in years 7 years 9 months 7 days 7 years 10 months 13 days 7 years 9 months 14 days
Weighted average remaining contractual life in years exercisable 7 years 3 months    
Stock option vested, Shares 4,100    
Tranche One      
Additional Information      
Stock option vested, Shares 500    
Tranche Two      
Additional Information      
Stock option vested, Shares 5,700    
Award vesting period 4 years    
Tranche Three      
Additional Information      
Stock option vested, Shares 4,000    
Award vesting period 1 year