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13. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
General and administrative expenses $ 3,145 $ 3,308 $ 10,743 $ 10,300
Selling expenses 4,010 4,306 11,648 10,733
Consulting Fees [Member]        
General and administrative expenses 250 248 750 787
Royalty Expense [Member]        
Selling expenses $ 150 $ 150 $ 450 $ 450