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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands | Nov. 30, 2015 | May. 31, 2015
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Payroll and related expenses | $ 7,984 | $ 10,330
Royalties | 2,444 | 2,237
Accrued severance | 0 | 158
Other | 600 | 489
Interest rate swap liability | 97 | 257
Accrued Professional Fees | 1,876 | 1,522
Deferred Revenue, Current | 651 | 447
Accrued Rent, Current | 24 | 808
Other | 3,299 | 2,083
Total | $ 16,975 | $ 18,331

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