Quarterly report pursuant to Section 13 or 15(d)

3. Summary of Significant Accounting Policies - Assumptions for the binomial pricing model (Details)

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3. Summary of Significant Accounting Policies - Assumptions for the binomial pricing model (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Warrants Issued April 8, 2011
Sep. 30, 2012
Warrants Issued June 20, 2011
Sep. 30, 2012
Warrants Issued April 8, 2011 Revalued April 5, 2012
Sep. 30, 2012
Warrants Issued June 20, 2011 Revalued April 5, 2012
Sep. 30, 2012
Warrants Issued November 10, 2011
Sep. 30, 2012
Warrants Issued November 10, 2011 Revalued September 30, 2012
Assumptions              
Expected term (in months) 6 years 36 months 36 months 24 months 24 months 60 months 50 months
Expected volatility 124.90% 118.50% 118.50% 100.00% 100.00% 104.50% 146.40%
Risk-free interest rate 0.70% 0.625% 0.625% 0.75% 0.75% 0.875% 0.4375%
Exercise price   $ 2.13 $ 2.13 $ 2.13 $ 2.13 $ 0.81 $ 0.40
Fair Value per warrant   $ 0.70 $ 0.62 $ 0.15 $ 0.15 $ 0.54 $ 0.26