Quarterly report pursuant to sections 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

v2.4.0.6
Convertible Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2012
May 31, 2012
May 31, 2010
Apr. 30, 2010
Class of Stock [Line Items]          
Preferred Stock, Shares issued 96,100 96,100 98,900    
Preferred Stock, Share price       $ 5.00  
Proceeds from issuance of preferred stock shares $ 405,718 $ 405,718 $ 451,993 $ 2,009,000  
Preferred stock, shares outstanding 96,100 96,100 98,900    
Convertible note conversion price per share $ 0.75 $ 0.75      
Common stock, shares authorized 100,000,000 100,000,000 100,000,000   100,000,000
Constructive dividend to Preferred stock holders   6,000,000      
Liquidation preference on common shares 5.00 5.00      
Dividends are payable to preferred stock holders   $ 0.25      
Face amount of notes $ 5,648,250 $ 5,648,250      
Earliest date for repayment of principal on notes Oct. 01, 2015        
Latest date for repayment of principal on notes Nov. 30, 2015        
Investor
          
Class of Stock [Line Items]          
Interest on convertible notes payment start date Apr. 01, 2013        
Warrants to purchase common shares, shares 7,530,676 7,530,676      
Minimum
          
Class of Stock [Line Items]          
Interest rate on convertible notes 5.00% 5.00%      
Minimum | Investor
          
Class of Stock [Line Items]          
Warrants exercise price per share 1.50 1.50      
Warrants exercisable expiration date Oct. 01, 2014        
Maximum
          
Class of Stock [Line Items]          
Interest rate on convertible notes 10.00% 10.00%      
Maximum | Investor
          
Class of Stock [Line Items]          
Warrants exercise price per share 2.00 2.00      
Warrants exercisable expiration date Nov. 30, 2014        
Series B convertible preferred stock
          
Class of Stock [Line Items]          
Preferred Stock, Shares issued       400,000  
Preferred stock, shares outstanding 96,100 96,100      
Common Stock
          
Class of Stock [Line Items]          
Preferred Stock, Share price       $ 10  
Convertible note conversion price per share       $ 0.50