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Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
2013 (remaining three months) $ 39,434  
2014 156,818  
2015 148,068  
2016 140,997  
2017 137,424  
2018 127,828  
Thereafter 693,488  
Net Carrying Amount $ 1,444,057 $ 1,463,059