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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,575,188 $ 1,357,749
Less accumulated depreciation (996,014) (905,479)
Property and equipment, net 579,174 452,270
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 253,562 122,653
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,039,268 992,232
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 10,467 10,467
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 193,920 190,554
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 77,971 $ 41,843