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10. Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Stock Based Compensation Tables  
Schedule of options granted under employee stock plans
Nine 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     (2,816,000 )     2,816,000       0.59  
Exercised           (153,846 )     0.45  
Forfeited/expired     554,154       (554,154 )     1.43  
Balance as of September 30, 2013     351,204       9,632,834     $ 0.55  
Schedule of weighted average fair value calculations for options
    As of September 30,  
    2013     2012  
Dividend-yield     0 %   0 %
Risk-free interest rate     0.16- 0.63 %   0.23-0.57
Expected volatility     64.92-74.18 %     58.88-81.24 %
Expected life (years)     1.25-3.0       0.5-4.0  
Weighted average fair value per share of common stock   $ 0.32 - 0.40     $ 0.61