Quarterly report pursuant to sections 13 or 15(d)

Stock Options and Warrants (Detail)

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Stock Options and Warrants (Detail) (USD $)
 6 Months Ended
Nov. 30, 2012
May 31, 2012
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 10,327,664  
Granted, Number of Shares 9,145,676  
Exercised, Number of Shares (755,000)  
Forfeited/expired/cancelled, Number of Shares (750,000)  
Options and warrants outstanding, Number of Shares 17,968,340 10,327,664
Outstanding exercisable, Number of Shares 16,376,596  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.60  
Granted, Weighted Average Exercise Price $ 1.70  
Exercised, Weighted Average Exercise Price $ 0.25  
Forfeited/expired/cancelled, Weighted Average Exercise Price $ 2.00  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.69 $ 1.60
Outstanding exercisable, Weighted Average Exercise Price $ 1.65  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 2 years 2 months 1 day 3 years 2 months 12 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 2 years 1 month 13 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 2,308,279  
Options and warrants outstanding, Aggregate Intrinsic Value 3,092,853 2,308,279
Outstanding exercisable, Aggregate Intrinsic Value $ 3,088,165