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Property and Equipment (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property and equipment $ 2,340,066   $ 2,340,066   $ 2,112,893
Less accumulated depreciation (1,180,477)   (1,180,477)   (1,056,561)
Property and equipment, net 1,159,589   1,159,589   1,056,332
Depreciation of property and equipment 69,574 $ 46,707 123,916 $ 93,941  
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 1,268,847   1,268,847   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 176,826   176,826   169,423
Leasehold Improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 569,285   $ 569,285   36,128
Construction in Progress          
Property, Plant and Equipment [Line Items]          
Property and equipment         $ 508,417