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7. Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
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, 2020     380       5,327     $ 1.14  
Authorized     816       -       -  
Granted     (950 )     950       3.09  
Exercised     -       (1,211 )     1.49  
Forfeited/expired     61       (61 )     1.91  
Balance as of March 31, 2021     307       5,005     $ 1.41  
Schedule of weighted average fair value calculations for options
   

For the three months

ended March 31,

 
Description   2021     2020  
Dividend-yield     0 %     0 %
Risk-free interest rate     0.70 %     1.08 %
Expected volatility     97.45 %     87.43 %
Expected life (years)     6.51       6.93  
Market value per share on grant date   $ 3.09     $ 0.71  
Fair value per share on grant date   $ 2.44     $ 0.54