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8. Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2018     149       2,889     $ 1.80  
Authorized     855       -       -  
Granted     (1,116 )     1,116       0.78  
Forfeited/expired     190       (190 )     3.11  
                         
Balance as of June 30, 2019     78       3,815     $ 1.50  
Schedule of weighted average fair value calculations for options
    For the three months ended June 30,  
Description   2019     2018  
Dividend-yield     0 %     0 %
Risk-free interest rate     2.00 %     3.04 %
Expected volatility     88.58 %     85.6 %
Expected life (years)     6.81       6.48  
Market value per share on grant date   $ 0.92     $ 1.71  
Fair value per share on grant date   $ 0.71     $ 1.28  
Schedule of weighted average fair value calculations for SARs
Description   June 30, 2019     December 31, 2018  
             
Risk-free interest rate     2.20 %     2.60 %
Expected volatility     101 %     125 %
Market value per share   $ 0.85     $ 0.61  
Fair value per share on grant date   $ 1.14     $ 1.08  
Activity of level 3 liabilities
  SARs Liability Balance
       
Balance as of December 31, 2018   $ 1,132  
Related change in fair value     35  
Balance as of March 31, 2019   $ 1,167  
Related change in fair value     25  
Balance as of June 30, 2019   $ 1,192