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Warrant Activity (Detail) (Warrant, USD $)
9 Months Ended
Sep. 30, 2013
Warrant
 
Number of Shares Issuable  
Balance, Beginning 27,353,151
Granted 4,375,004
Exercised 0
Cancelled (400,000)
Balance, Ending 31,328,155
Weighted Average Exercise Price  
Balance, Beginning $ 0.76
Granted $ 0.60
Exercised $ 0
Cancelled $ 1.79
Balance, Ending $ 0.73