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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2023
May 31, 2022
Income Tax Disclosure [Abstract]    
Income tax expense (benefit) $ (523) $ 540
Effective income tax rate reconciliation, percent 1.20% (2.40%)
Tax net operating losses $ 114,800 $ 83,600
Operating loss carryforwards, not subject to expiration 99,300  
Increase in valuation allowance $ 6,300 $ 6,200