Annual report pursuant to Section 13 and 15(d)

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

v3.23.2
Equity Awards and Warrants - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2021
May 31, 2023
May 31, 2022
May 31, 2021
Jul. 31, 2022
RSU and PSU          
Number of shares          
Beginning shares   300 5,470    
Granted (in shares)   1,293      
Forfeited (in shares)   (150) (4,356)    
Vested (in shares)   (150) (814)    
Ending shares   1,293 300 5,470  
Weighted average grant date fair value          
Beginning   $ 3.12 $ 2.96    
Grant   0.58      
Forfeited   3.12 2.94    
Vested   3.12 3.01    
Ending   $ 0.58 $ 3.12 $ 2.96  
Weighted average remaining contractual life in years   9 months 21 days 6 months 29 days 1 year 3 days  
Performance target level percentage for non-vested equity-based payment instruments   100.00%      
Performance Shares [Member]          
Weighted average grant date fair value          
Unrecognized compensation expense   $ 0.4     $ 0.6
Expected to be recognized over weighted-average period   9 months 21 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%        
RSU          
Weighted average grant date fair value          
Unrecognized compensation expense         $ 0.6