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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