Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, net - Additional Information (Detail)

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Property and Equipment, net - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 15,989 $ 15,657
Laboratory Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Equipment retired $ 885,000