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Accrued Liabilities (Details) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
--- | --- | ---
Accrued liabilities |  |
Payroll and related expenses | $ 10,235 | $ 11,383
Royalties | 1,537 | 2,885
Accrued severance | 1,940 | 2,075
Sales and franchise taxes | 683 | 856
Outside services | 2,396 | 1,622
Litigation matters (Note 15) | 12,500 | 12,500
Acculis recall liability | 0 | 2,563
Other | 5,135 | 4,920
Total | $ 34,426 | $ 38,804

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