Quarterly report pursuant to sections 13 or 15(d)

Rescission Liabilities - Additional Information (Detail)

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Rescission Liabilities - Additional Information (Detail) (USD $)
Feb. 28, 2014
May 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Rescission liability $ 378,000 $ 536,500