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Property and Equipment (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,540,868 $ 2,416,371  
Less accumulated depreciation (1,583,642) (1,309,472)  
Property and equipment, net 957,226 1,106,899  
Depreciation of property and equipment 275,123 263,541 $ 190,540
Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment 334,300 314,024  
Laboratory Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,389,036 1,325,667  
Office Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 11,085 11,085  
Computer Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 233,282 192,430  
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 573,165 $ 573,165