Quarterly report pursuant to sections 13 or 15(d)

8. Derivative liability (Details)

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8. Derivative liability (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Derivative [Line Items]    
Risk-free interest rate 0.10% 0.12%
Expected volatility 206.00% 92.00%
Expected life (in years) 0.29 0.75-1.00
Expected dividend yield 0 0
Total Fair Value $ 3,035,739 $ 1,643,139
2009 Summer Warrants [Member]
   
Derivative [Line Items]    
Total Fair Value    332,998
2009 Wellfleet Warrants [Member]
   
Derivative [Line Items]    
Total Fair Value    17,807
2009 Fall Warrants [Member]
   
Derivative [Line Items]    
Total Fair Value $ 3,035,739 $ 1,292,334