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Property and Equipment (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,185,415   $ 2,112,893
Less accumulated depreciation (1,110,900)   (1,056,561)
Property and equipment, net 1,074,515   1,056,332
Depreciation of property and equipment 54,339 $ 47,234  
Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment 294,404   262,135
Laboratory Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,136,913   1,130,180
Office Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 11,084   6,610
Computer Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 173,729   169,423
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 569,285   36,128
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property and equipment     $ 508,417