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Convertible Notes (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Convertible, unsecured promissory note, due 2012 (4.0%) $ 2,707,301 $ 2,832,301
Less current portion 500,000 375,000
Total debt, less current portion $ 2,207,301 $ 2,457,301