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8. Stock-Based Compensation (Tables)
9 Months Ended
Sep. 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  
Exercised     -       -       -  
Forfeited/expired     190       (190 )     3.11  
                         
Balance as of September 30, 2019     78       3,815     $ 1.44