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Summary of Warrant Activity with Non-Employees (Detail) (Warrant, USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
May 31, 2012
May 31, 2011
Warrant
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Outstanding warrants at beginning of year 7 29
Shares, Warrants exercised during the year (2) (20)
Shares, Warrants forfeited during the year (5) (2)
Shares, Outstanding warrants at end of year 0 7
Weighted-Average Exercise Price, Outstanding warrants at beginning of year $ 9.02 $ 8.48
Weighted-Average Exercise Price, Warrants exercised during the year $ 9.02 $ 8.30
Weighted-Average Exercise Price, Warrants forfeited during the year $ 9.02 $ 8.18
Weighted-Average Exercise Price, Outstanding warrants at end of year $ 0 $ 9.02