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Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense relates to intangible assets $ 880,605 $ 0 $ 1,762,701 $ 0
Indefinite-lived intangible assets other than goodwill     $ 0