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Property and Equipment - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 40,789 $ 33,306 $ 114,261 $ 97,622