Intangible Assets (Schedule of Intangible Assets) (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Intangible Assets Disclosure [Line Items]
Patent costs	$ 1,154,523	$ 1,154,523
Less — Accumulated amortization	(1,129,094)	(1,029,497)
Less — Write off related to patents no longer in use	0	(66,147)
Total	$ 25,429	$ 58,879