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Intangible Assets (Detail) (USD $) | Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Intangible Assets |  |  |
Less: accumulated amortization | $ (276,615) | $ (261,928) | $ (291,658)
Intangible assets, net | 590,458 | 573,731 | 899,480
Licensing agreements |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 802,994 | 772,230 | 899,231
Patents |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | $ 64,079 | $ 63,429 | $ 291,907

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