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Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
Balance as of December 31, 2013 $ 2,139,294
Foreign currency translation 68,539
Balance as of June 30, 2014 $ 2,207,833