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12. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
General and administrative expenses $ 2,996 $ 3,813 $ 6,701 $ 7,598
Selling expenses 3,383 3,400 7,401 7,638
Consulting Fees [Member]        
General and administrative expenses 250 250 500 500
Royalty Expense [Member]        
Selling expenses $ 150 $ 150 $ 300 $ 300