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Property and Equipment (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,112,893 $ 1,423,477  
Less accumulated depreciation (1,056,561) (902,099)  
Property and equipment, net 1,056,332 521,378  
Depreciation of property and equipment 190,540 191,484 $ 158,708
Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment 262,135 230,987  
Laboratory Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,130,180 965,586  
Office Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 6,610 9,723  
Computer Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 169,423 181,053  
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment 36,128 $ 36,128  
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 508,417