Quarterly report pursuant to sections 13 or 15(d)

Common Stock Issued for Services - Additional Information (Detail)

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Common Stock Issued for Services - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2012
Director
   
Common Stock Issued For Services [Line Items]    
Stock-based compensation recognized $ 12,500 $ 25,000
Director | Transaction 01
   
Common Stock Issued For Services [Line Items]    
Common stock issued   16,230
Issue price per share $ 0.77 $ 0.77
Director | Transaction 02
   
Common Stock Issued For Services [Line Items]    
Common stock issued   7,810
Issue price per share $ 1.60 $ 1.60
Consultant
   
Common Stock Issued For Services [Line Items]    
Common stock issued   60,000
Issue price per share $ 2.68 $ 2.68
Stock-based compensation recognized $ 8,000 $ 161,000