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Intangible Assets (Schedule of Intangible Assets) (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Intangible Assets Disclosure [Line Items]    
Patent costs $ 1,154,523us-gaap_FiniteLivedPatentsGross $ 1,154,523us-gaap_FiniteLivedPatentsGross
Less - Accumulated amortization (958,758)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (864,658)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total $ 195,765us-gaap_IntangibleAssetsNetExcludingGoodwill $ 289,865us-gaap_IntangibleAssetsNetExcludingGoodwill