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Property and Equipment, Net, and Other Assets - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property Plant And Equipment [Abstract]        
Depreciation $ 70,335 $ 72,894 $ 146,381 $ 142,461