Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Summary of Property and Equipment, Net (Detail)

v2.4.0.8
Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,556,549 $ 1,537,740
Accumulated depreciation and amortization (1,529,636) (1,453,149)
Property and equipment, net 26,913 84,591
Furniture and Fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 20,742 20,742
Laboratory Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 769,157 757,882
Leasehold Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 487,871 487,871
Office and Computer Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 278,779 $ 271,245