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Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]        
Amortization expense related to intangible assets $ 494,301 $ 547,448 $ 1,517,285 $ 1,629,264