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Property and Equipment - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property Plant And Equipment [Abstract]        
Depreciation expense $ 38,852 $ 32,378 $ 73,472 $ 64,319