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Summary of Stock Warrant Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Shares  
Outstanding, December 31, 2011 6,673,405
Granted 1,379,739
Exercised (12,177)
Forfeited/cancelled (616,726)
Outstanding, June 30, 2012 7,424,241
Weighted Average Exercise Price  
Outstanding, December 31, 2011 $ 3.95
Granted $ 5.63
Exercised $ 3.18
Forfeited/cancelled $ 10.62
Outstanding, June 30, 2012 $ 3.71