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13. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
General and administrative expenses $ 3,813 $ 3,046 $ 7,598 $ 6,992
Selling expenses 3,400 3,463 7,638 6,427
Consulting Fees [Member]        
General and administrative expenses 250 213 500 539
Royalty Expense [Member]        
Selling expenses $ 150 $ 150 $ 300 $ 300