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Property and Equipment (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Property and equipment $ 1,712,876   $ 1,712,876   $ 1,423,477
Less accumulated depreciation (1,036,283)   (1,036,283)   (902,099)
Property and equipment, net 676,593   676,593   521,378
Depreciation of property and equipment 45,808 $ 51,882 139,749 $ 142,417  
Furniture and Fixtures [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment 230,987   230,987   230,987
Laboratory Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment 978,511   978,511   965,586
Office Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment 9,723   9,723   9,723
Computer Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment 186,172   186,172   181,053
Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment 36,128   36,128   $ 36,128
Construction in Progress [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 271,355   $ 271,355