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Summary of Stock Warrant Activity (Detail) (USD $)
1 Months Ended 9 Months Ended
May 31, 2010
Sep. 30, 2012
Shares    
Outstanding, December 31, 2011   6,673,405
Granted   1,379,739
Exercised   (12,177)
Forfeited/cancelled (4,500) (616,726)
Outstanding, September 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, September 30, 2012   $ 3.71