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Property and Equipment, Net, and Other Assets - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property Plant And Equipment [Abstract]        
Depreciation $ 71,844 $ 81,038 $ 218,225 $ 223,499