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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,440,747 $ 1,423,477
Less accumulated depreciation (949,333) (902,099)
Property and equipment, net 491,414 521,378
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 230,987 230,987
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 982,856 965,586
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 9,723 9,723
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 181,053 181,053
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 36,128 $ 36,128