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13. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
General and administrative expenses $ 13,955 $ 13,783
Selling expenses 16,595 14,467
Consulting Fees [Member]    
General and administrative expenses 1,000 1,000
Royalty Expense [Member]    
General and administrative expenses $ 600 $ 600