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Summary of Warrants Activity for Investor (Detail) (Warrant, USD $)
 1 Months Ended 6 Months Ended
Oct. 31, 2009
Jun. 30, 2012
Year
Warrant
    
Number of shares    
Outstanding, beginning balance   50,000
Exercisable, beginning balance   50,000
Granted 200,000   
Exercised     
Forfeited     
Outstanding, ending balance   50,000
Exercisable, ending balance   50,000
Average Exercise Price per Share    
Outstanding, beginning balance   $ 1.50
Exercisable, beginning balance   $ 1.50
Granted     
Exercised $ 1.50   
Forfeited     
Outstanding, ending balance   $ 1.50
Exercisable, ending balance   $ 1.50
Weighed Average Remaining Contractual Term in years    
Outstanding, beginning balance   2.75
Exercisable, beginning balance   2.75
Outstanding, ending balance   2.25
Exercisable, ending balance   2.25