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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands | Feb. 28, 2021 | May 31, 2020
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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

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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