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10. Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 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, 2017     196       2,189     $ 2.70  
Authorized     655       -       -  
Granted     (1,148 )     1,148       1.07  
Exercised     -       (2 )     0.67  
Forfeited/expired     446       (446 )     4.35  
Balance as of December 31, 2018     149       2,889     $ 1.80  
Authorized     855       -       -  
Granted     (1,116 )     1,116       0.78  
Forfeited/expired     259       (259 )     3.53  
                         
Balance as of December 31, 2019     147       3,746     $ 1.38  
Vested and unvested awards outstanding
    Number of Shares      Weighted Average Exercise Price     Remaining Contractual Term (In Years)     Average Intrinsic Value1  
2019                        
Vested and Exercisable     2,659     $ 1.56       7.45     $ 145  
Unvested     1,087       0.93       8.78       77  
Total     3,746     $ 1.38       7.84     $ 222  
                                 
2018                                
Vested and Exercisable     1,923     $ 2.01       7.34     $ -  
Unvested     966       1.38       8.81       -  
Total     2,889     $ 1.80       7.80     $ -  
Schedule of weighted average fair value calculations for options

Description

   For the years ended December 31,  
    2019     2018  
Dividend-yield     0 %     0 %
Risk-free interest rate     2.38 %     2.71 %
Expected volatility     88.54 %     82.99 %
Expected life (years)     6.55       6.48  
Market value per share on grant date   $ 0.78     $ 1.07  
Fair value per share on grant date   $ 0.59     $ 0.79