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Property and Equipment (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,432,989   $ 2,416,371
Less accumulated depreciation (1,378,229)   (1,309,472)
Property and equipment, net 1,054,760   1,106,899
Depreciation of property and equipment 68,757 $ 54,339  
Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment 314,024   314,024
Laboratory Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,327,653   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 207,062   192,430
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 573,165   $ 573,165