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Debt (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Less debt discount $ (2,107,710) $ (1,457,025)
Total - long term debt 6,770,478 5,671,162
8% convertible promissory notes due on august 2017
   
Debt Instrument [Line Items]    
Convertible debt, due date 2017-08  
Convertible debt $ 8,878,188 $ 7,128,187