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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,245,595 $ 1,155,710
Less accumulated depreciation (824,955) (755,911)
Property and equipment, net 420,640 399,799
Furniture and Fixtures [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 118,201 108,815
Laboratory Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 901,955 826,821
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 173,129 167,764
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 41,843 $ 41,843