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Property and Equipment - 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 expense $ 46,290 $ 38,852 $ 90,535 $ 73,472