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10. Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
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, 2014     5       1,015     $ 5.51  
Authorized     200              
Granted     (25 )     25       3.88  
Exercised     -       (71 )     2.12  
Forfeited/expired     43       (43 )     2.12  
Balance as of March 31, 2015     223       926     $ 5.89  
Schedule of weighted average fair value calculations for options
  For the quarter ended March 31  
  2015     2014  
Dividend-yield   0 %     0 %
Risk-free interest rate   0.89 %     0.74
Expected volatility   78.79 %       78.73 %
Expected life (years)   3       3  
Market value per share on grant date $ 3.88     $ 4.20  
Weighted average fair value per share on grant date $ 1.99     $ 2.14