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Property and Equipment (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property and equipment $ 2,372,753   $ 2,372,753   $ 2,112,893
Less accumulated depreciation (1,250,537)   (1,250,537)   (1,056,561)
Property and equipment, net 1,122,216   1,122,216   1,056,332
Depreciation of property and equipment 70,060 $ 45,808 193,976 $ 139,749  
Furniture and Fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment 314,024   314,024   262,135
Laboratory Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 1,282,655   1,282,655   1,130,180
Office Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 11,084   11,084   6,610
Computer Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 191,825   191,825   169,423
Leasehold Improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 573,165   $ 573,165   36,128
Construction in Progress          
Property, Plant and Equipment [Line Items]          
Property and equipment         $ 508,417