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Warrant Activity (Detail) (Warrant, USD $)
3 Months Ended
Mar. 31, 2013
Warrant
 
Number of Shares Issuable  
Balance, Beginning 27,353,151
Granted 4,375,004
Exercised 0
Cancelled 0
Balance, Ending 31,728,155
Weighted Average Exercise Price  
Balance, Beginning $ 0.76
Granted $ 0.60
Exercised $ 0
Cancelled $ 0
Balance, Ending $ 0.74