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 12 Months Ended
Nov. 30, 2013
May 31, 2013
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 18,146,938  
Granted, Number of Shares 17,848,540  
Exercised, Number of Shares (50,000)  
Forfeited /expired/ cancelled, Number of Shares (1,578,645)  
Options and warrants outstanding, Number of Shares 34,366,833 18,146,938
Outstanding exercisable - Number of Shares 32,570,497  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.65  
Granted,Weighted Average Exercise Price $ 0.74  
Exercised,Weighted Average Exercise Price $ 1.00  
Forfeited/expired/cancelled,Weighted Average Exercise Price $ 1.40  
Options and warrants outstanding ,Weighted Average Exercise Price $ 1.19 $ 1.65
Outstanding exercisable ,Weighted Average Exercise Price $ 1.19  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 5 months 19 days 1 year 10 months 10 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 5 months 16 days  
Options and warrants outstanding , Aggregate Intrinsic Value $ 140,321  
Options and warrants outstanding , Aggregate Intrinsic Value 10,474,005 140,321
Exercisable , Aggregate Intrinsic Value $ 9,902,708