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Accrued Liabilities (Tables)
 9 Months Ended
Feb. 28, 2023
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued liabilities consisted of the following:
(in thousands)Feb 28, 2023May 31, 2022
Payroll and related expenses$9,355 $20,232 
Royalties2,202 2,986 
Outside services3,171 3,731 
Research and development1,368 1,279 
Sales and franchise taxes328 750 
Rebates359 511 
Other4,992 5,353 
$21,775 $34,842