Quarterly report pursuant to sections 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

v2.4.0.6
Convertible Instruments - Additional Information (Detail) (USD $)
 9 Months Ended
Feb. 28, 2013
May 31, 2012
May 31, 2010
Apr. 30, 2010
Class of Stock [Line Items]        
Preferred Stock, Shares issued 95,100 98,900    
Preferred Stock, Share price     $ 5.00  
Proceeds from issuance of preferred stock shares $ 363,497 $ 451,993 $ 2,009,000  
Preferred stock, shares outstanding 95,100 98,900    
Convertible note conversion price per share $ 0.75      
Common stock, shares authorized 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      
Dividends are payable to preferred stock holders $ 0.25      
Face amount of notes $ 5,908,250      
Earliest date for repayment of principal on notes Oct. 01, 2015      
Latest date for repayment of principal on notes Jan. 15, 2016      
Investor
        
Class of Stock [Line Items]        
Interest on convertible notes payment start date Apr. 01, 2013      
Warrants to purchase common shares, shares 7,877,343      
Minimum
        
Class of Stock [Line Items]        
Interest rate on convertible notes 5.00%      
Minimum | Investor
        
Class of Stock [Line Items]        
Warrants exercise price per share 1.50      
Warrants exercisable expiration date Oct. 01, 2014      
Maximum
        
Class of Stock [Line Items]        
Interest rate on convertible notes 10.00%      
Maximum | Investor
        
Class of Stock [Line Items]        
Warrants exercise price per share 2.00      
Warrants exercisable expiration date Jan. 15, 2015      
Series B convertible preferred stock
        
Class of Stock [Line Items]        
Preferred Stock, Shares issued     400,000  
Preferred stock, shares outstanding 95,100      
Common Stock
        
Class of Stock [Line Items]        
Preferred Stock, Share price     $ 10  
Convertible note conversion price per share     $ 0.50  
Common Stock | Investor
        
Class of Stock [Line Items]        
Warrants to purchase common shares, shares 7,121,667