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Property and Equipment (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Property and equipment $ 2,457,305   $ 2,457,305   $ 2,416,371
Less accumulated depreciation (1,446,837)   (1,446,837)   (1,309,472)
Property and equipment, net 1,010,468   1,010,468   1,106,899
Depreciation of property and equipment 69,560 $ 69,574 138,317 $ 123,916  
Furniture and Fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment 326,990   326,990   314,024
Laboratory Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 1,338,272   1,338,272   1,325,667
Office Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 11,085   11,085   11,085
Computer Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 207,793   207,793   192,430
Leasehold Improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 573,165   $ 573,165   $ 573,165