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7. Stock-Based Compensation (Details)
 3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Shares available for grant, beginning (in thousands) 147
Shares available for grant, authorized (in thousands) 1,892
Shares available for grant, granted (in thousands) (1,847)
Shares available for grant, ending (in thousands) 192
Number of outstanding, beginning (in thousands) 3,746
Number of shares, granted (in thousands) 1,847
Number of outstanding, ending (in thousands) 5,593
Weighted average exercise price outstanding, beginning | $ / shares $ 1.38
Weighted average exercise price, granted | $ / shares .71
Weighted average exercise price outstanding, ending | $ / shares $ 1.16