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Income Taxes - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Income Taxes [Line Items]    
Unrecognized tax benefits   $ 4,869,000
Net operating loss carry forwards 18,700,000  
Net operating loss carry forward, expiration year 2018  
Tax credit carry forwards $ 1,347,000  
Tax credit carry forwards, expiration year 2017