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14. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transactions [Abstract]        
Consulting fees $ 250 $ 250 $ 500 $ 500
Royalty expense $ 150 $ 148 $ 300 $ 298