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INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2023
May 31, 2022
Current expense / (benefit)    
Federal $ 0 $ 0
Foreign 0 0
State 18 0
Total current expense 18 0
Deferred expense / (benefit)    
Federal (540) 540
Foreign 0 0
State 0 0
Total deferred (benefit) expense (540) 540
Total income tax (benefit) expense $ (523) $ 540