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12. Related party transactions (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
General and administrative expenses $ 3,705 $ 3,785
Selling expenses 4,018 4,238
Royalty Expense [Member]    
Selling expenses 150 150
Consulting Fees [Member]    
General and administrative expenses $ 250 $ 250