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Accrued Liabilities
9 Months Ended
Feb. 28, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities ACCRUED LIABILITIES
Accrued liabilities consisted of the following: 
(in thousands)Feb 28, 2021May 31, 2020
Payroll and related expenses$15,159 $13,059 
Royalties2,052 2,392 
Accrued severance370 794 
Sales and franchise taxes576 634 
Outside services2,291 2,222 
Indemnification holdback4,625 5,000 
Other5,687 5,279 
$30,760 $29,380