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Accrued Liabilities (Details) - USD ($) $ in Thousands | May 31, 2016 | Nov. 30, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May 31, 2014 | May 31, 2013
--- | --- | --- | --- | --- | --- | --- | --- | ---
Accrued liabilities |  |  |  |  |  |  |  |
Payroll and related expenses | $ 9,414 |  | $ 10,297 |  |  |  |  |
Royalties | 2,489 |  | 2,237 |  |  |  |  |
Accrued severance | 1,524 |  | 158 |  |  |  |  |
Sales and franchise taxes | 565 |  | 489 |  |  |  |  |
Interest rate swap liability | 0 |  | 257 |  |  |  |  |
Outside services | 2,063 |  | 1,522 |  |  |  |  |
Deferred Rent | 35 |  | 808 |  |  |  |  |
Other | 5,806 |  | 2,341 |  |  |  |  |
Total | $ 21,896 | $ 16,858 | $ 18,109 | $ 19,485 | $ 18,589 | $ 17,522 | $ 15,940 | $ 15,961

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