Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Intangible Assets (Detail)

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Intangible Assets - Intangible Assets (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Less: accumulated amortization $ (296,676) $ (261,928)
Intangible assets, net 579,817 573,731
License agreements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 805,717 772,230
Patents [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 70,776 $ 63,429