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Warrants Outstanding (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Warrant
Shares      
Outstanding at January 1, 2013 0 0 59,066,992
Granted     10,293,052
Exchanged cancelled     (2,206,273)
Exchanged issued     4,031,956
Cancelled     0
Exercised     0
Outstanding at June 30, 2013 0 0 71,185,727
Exercisable at end of the period     71,185,727
Weighted Average Exercise Price      
Outstanding at January 1, 2013     $ 0.18
Granted     $ 0.07
Exchanged cancelled     $ 0.13
Exchanged issued     $ 0.08
Cancelled     $ 0
Exercised     $ 0
Outstanding at June 30, 2013     $ 0.16
Exercisable at end of the period     $ 0.16