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8. Stock-Based Compensation (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation [Abstract]    
Options vested 2,200  
Stock compensation expense $ 290 $ 264
Options granted 717  
Unrecognized compensation expense $ 900  
Unrecognized compensation expense, recognition period 1 year 11 months 16 days