Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plan - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details)

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Equity Incentive Plan - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Weighted average grant date fair value      
Expected to be recognized over weighted-average period 1 year 10 months 24 days    
Share-based Compensation $ 2,415 $ 4,275  
RSU and PSU      
Number of shares      
Beginning shares 1,293 300  
Granted (in shares)   1,293  
Forfeited (in shares) (1,293) (150)  
Vested (in shares)   (150)  
Ending shares   1,293 300
Weighted average grant date fair value      
Beginning $ 0.58 $ 3.12  
Grant   0.58  
Forfeited $ 0.58 3.12  
Vested   3.12  
Ending   $ 0.58 $ 3.12
Weighted average remaining contractual life in years   9 months 21 days 6 months 29 days
Performance target level percentage for non-vested equity-based payment instruments 100.00%    
Stock Options and Warrants      
Weighted average grant date fair value      
Unrecognized compensation expense $ 900    
Vested during the period, grant date fair value 3,300 $ 4,900  
Equity Instruments | General and Administrative Expenses      
Weighted average grant date fair value      
Share-based Compensation $ 2,400 $ 4,200