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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 463,569 $ 819,922
Restricted deposits 57,700 57,700
Other receivables 814 22,334
Deposits 12,768 16,293
Prepaid expenses and other current assets $ 534,851 $ 916,249