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6. Stock-Based Compensation (Tables)
9 Months Ended
Sep. 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     440       (440 )     4.35  
Balance as of September 30, 2018     143       2,895     $ 1.80