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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,169,630 $ 1,155,710
Less accumulated depreciation (790,531) (755,911)
Property and equipment, net 379,099 399,799
Furniture, Fixtures and Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 108,815 108,815
Laboratory Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 835,061 826,821
Office Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,467 10,467
Computer Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 173,444 167,764
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 41,843 $ 41,843