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Concentrations of risk and segment information - Schedule of Customer Concentration by Risk Factor (Details) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable [Member] | Customer A (Retailer) [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 40.00% 17.00%  
Accounts Receivable [Member] | Customer B (Distributor) [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 18.00% 11.00%  
Accounts Receivable [Member] | Customer C (Retailer) [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   14.00%  
Sales Revenue [Member] | Customer A (Retailer) [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00%    
Sales Revenue [Member] | Customer D (Retailer) [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 20.00% 17.00%