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Property and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property and Equipment        
Depreciation of property and equipment $ 46,707 $ 46,290 $ 93,941 $ 90,535