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7. Derivative liability (Tables)
6 Months Ended
Jun. 30, 2013
Derivative Liability [Abstract]  
The derivative liabilities were valued using a probability weighted average series of Black-Scholes-Merton models

 

   Fair Value of Warrants 
   January 15,
2013
   December 31,
2012
 
Risk-free interest rate   0.09%   0.02%
Expected volatility   165%   165%
Expected life (in years)   0.04    0.04 
Expected dividend yield   0%   0%
Fair Value - 2009 Fall Warrants  $3,441,752   $3,221,138