Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details)

v3.23.1
Equity Awards and Warrants - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Feb. 28, 2023
May 31, 2022
RSU and PSU    
Number of shares    
Beginning shares 300  
Granted (in shares) 1,293  
Forfeited (in shares) (150)  
Vested (in shares) (150)  
Ending shares 1,293 300
Weighted average grant date fair value    
Beginning $ 3.12  
Grant 0.58  
Forfeited 3.12  
Vested 3.12  
Ending $ 0.58 $ 3.12
Remaining contractual life in years 1 year 14 days 6 months 29 days
Performance target level percentage for non-vested equity-based payment instruments 100.00%  
Unrecognized compensation expense $ 0.6  
Performance Shares [Member]    
Weighted average grant date fair value    
Unrecognized compensation expense $ 0.4  
Expected to be recognized over weighted-average period 1 year 14 days  
Performance Shares [Member] | Maximum    
Weighted average grant date fair value    
Performance target level percentage for non-vested equity-based payment instruments 100.00%  
Performance Shares [Member] | Minimum    
Weighted average grant date fair value    
Performance target level percentage for non-vested equity-based payment instruments 0.00%