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13. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
General and administrative expenses $ 3,785 $ 3,946
Selling expenses 4,238 2,964
Consulting Fees [Member]    
General and administrative expenses 326 250
Royalty Expense [Member]    
General and administrative expenses $ 150 $ 150