Property and Equipment - Property and Equipment (Detail) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 3,176,384	$ 3,132,360
Less accumulated depreciation	(2,498,681)	(2,356,838)
Property Plant and Equipment Net	677,703	775,522
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	39,095	42,064
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	292,423	266,695
Scientific Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 2,844,866	$ 2,823,601