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Common Stock Warrant Activity (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Shares  
Outstanding, December 31, 2012 7,424,241
Granted 5,000
Exercised   
Forfeited/cancelled   
Outstanding, March 31, 2013 7,429,241
Weighted Average Exercise Price  
Outstanding, December 31, 2012 $ 3.71
Granted $ 2.65
Exercised   
Forfeited/cancelled   
Outstanding, March 31, 2013 $ 3.71