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13. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transactions [Abstract]        
Consulting fees $ 250 $ 250 $ 750 $ 750
Royalty expense $ 150 $ 143 $ 450 $ 441