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7. Stock-Based Compensation (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]      
Options outstanding 5,005   5,327
Options vested 2,900    
Stock compensation expense $ 835 $ 310  
Options granted (950)    
Unrecognized compensation expense $ 2,300    
Unrecognized compensation expense, recognition period 2 years 5 months 5 days