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5. Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
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, 2016     98       1,632     $ 4.37  
Authorized     655       -       -  
Granted     (637 )     637       1.72  
Forfeited/expired     11       (11 )     4.75  
Balance as of June 30, 2017     127       2,258     $ 3.62