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Accrued Liabilities (Tables) | 12 Months Ended
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May 31, 2018
Payables and Accruals [Abstract] |
Accrued liabilities | As of May 31, 2018 and 2017, accrued liabilities consist of the following:
| May 31, 2018 |  | May 31, 2017
(in thousands) |
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 | — |  |  | 2,563 |
Other | 5,135 |  |  | 4,920 |
Total | $ | 34,426 |  |  | $ | 38,804 |

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