Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.4
Equity Awards and Warrants - Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU"s) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Nov. 30, 2022
USD ($)
$ / shares
shares
RSU and PSU  
Number of shares  
Beginning shares | shares 300
Granted (in shares) | shares 1,293
Forfeited (in shares) | shares (67)
Vested (in shares) | shares (150)
Ending shares | shares 1,376
Weighted average grant date fair value  
Beginning | $ / shares $ 3.12
Grant | $ / shares 0.58
Vested | $ / shares 3.12
Forfeited | $ / shares 3.12
Ending | $ / shares $ 0.73
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 | $ $ 0.6
Expected to be recognized over weighted-average period 2 years 7 months 6 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%