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7. Stock-Based Compensation (Details) - $ / shares
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]    
Shares available for grant, beginning (in thousands) 147  
Shares available for grant, authorized (in thousands) 2,342  
Shares available for grant, granted (in thousands) (2,320) (399)
Shares available for grant, exercised (in thousands) 0  
Shares available for grant, forfeited/expired (in thousands) 83  
Shares available for grant, ending (in thousands) 252  
Number of outstanding, beginning (in thousands) 3,746  
Number of shares, granted (in thousands) 2,320  
number of shares, exercised (in thousands) (232)  
Number of shares, forfeited/expired (in thousands) (83)  
Number of outstanding, ending (in thousands) 5,751  
Weighted average exercise price outstanding, beginning $ 1.38  
Weighted average exercise price, granted .69  
Weighted average exercise price, exercised 1.27  
Weighted average exercise price, forfeited/expired .76  
Weighted average exercise price outstanding, ending $ 1.12