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9. Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Weighted average dilutive share equivalents from common warrants  
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, 2016     98       1,632     $ 4.37  
Authorized     655       -       -  
Granted     (899 )     899       1.41  
Forfeited/expired     342       (342 )     -  
Balance as of December 31, 2017     196       2,189     $ 2.70  
Schedule of weighted average fair value calculations for options

    Number of Shares      Weighted Average Exercise Price     Remaining Contractual Term (In Years)     Average Intrinsic Value (1)  
2017                        
Vested and Exercisable     1,515     $ 2.94       5.83     $ -  
Unvested     674       2.16       8.62       -  
Total     2,189     $ 2.70       6.68     $ -  
                                 
2016                                
Vested and Exercisable     977     $ 5.45       3.28     $ -  
Unvested     655       2.76       8.66       -  
Total     1,632     $ 4.37       5.44     $ -  

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(1) Intrinsic value based on the $0.55 and $1.39 closing price of Aemetis stock on December 31, 2017 and 2016 respectively, as reported on the NASDAQ Exchange.

Schedule of assumptions for weighted-average fair value calculations for options granted
      For the years ended December 31,     

  Description

      2017          2016   
Dividend-yield     0 %     0 %
Risk-free interest rate     2.22 %     1.66 %
Expected volatility     76.96 %     77.69 %
Expected life (years)     6.42       6.99  
Market value per share on grant date   $ 1.41     $ 2.52  
Fair value per share on grant date   $ 0.99     $ 1.79