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6. Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Third Eye Capital Revenue Participation Term Notes  
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, 2017     196       2,189     $ 2.70  
Authorized     655       -       -  
Granted     (1,148 )     1,148       1.07  
Exercised     -       (2 )     0.67  
Forfeited/expired     414       (414 )     4.38  
Balance as of June 30, 2018     117       2,921     $ 1.82  
Assumptions for options granted

Description

  For the three months ended June 30, 2018  
Dividend-yield     0 %
Risk-free interest rate     3.04 %
Expected volatility     85.6 %
Expected life (years)     6.48  
Market value per share on grant date   $ 1.71  
Fair value per share on grant date   $ 1.28