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10. Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2013
Stock Based Compensation Tables  
Schedule of options granted under employee stock plans
Six Months Ended   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     (2,145,000 )     2,145,000       0.65  
Exercised           (153,846 )     0.45  
Forfeited/expired     466,154       (466,154 )     1.29  
Balance as of June 30, 2013     934,204       9,049,834     $ 0.57  
Schedule of weighted average fair value calculations for options
    Three and Six months
ended June 30
 
    2013     2012  
Dividend-yield     0 %   0 %
Risk-free interest rate     0.18- 0.42 %   1.22-3.66
Expected volatility     74.83-142.90 %     58.88-120.90 %
Expected life (years)     0.5-3.0       0.2-4.0  
Weighted average fair value per share of common stock   $ 0.08 - 0.32     $ 0.56