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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
May 31, 2020
Other Liabilities Disclosure [Abstract]    
Payroll and related expenses $ 15,159 $ 13,059
Royalties 2,052 2,392
Accrued severance 370 794
Sales and franchise taxes 576 634
Outside services 2,291 2,222
Indemnification holdback 4,625 5,000
Other 5,687 5,279
Total accrued liabilities $ 30,760 $ 29,380