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11. Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Stock Based Compensation Tables  
Schedule of options granted under employee stock plans

   Shares Available for Grant  Number of Shares Outstanding  Weighted-Average Exercise Price
 Balance as of December 31, 2012    1,613,050    7,524,834   $0.59 
 Authorized    1,000,000    —      —   
 Granted    (1,735,000)   1,735,000    0.65 
 Exercised    —      (153,846)   0.45 
 Forfeited/expired    346,154    (346,154)   0.45 
 Balance as of March 31, 2013    1,224,204    8,759,834   $0.61 

 

Schedule of weighted average fair value calculations for options
  Quarter Ended March 31  
    2013     2012  
Dividend-yield     0 %   0 %
Risk-free interest rate     0.42 %   1.22-3.66
Expected volatility     75.55 %     58.88-120.90 %
Expected life (years)     3.0       0.2-4.0  
Weighted average fair value per share of common stock   $ 0.32     $ 0.56