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Net sales (Details Textual)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Net Sales [Line Items]      
Percentage of entity's revenue 10.00%    
Trade receivables [member]      
Disclosure Of Net Sales [Line Items]      
Percentage of entity's revenue 43.00% 49.00%  
Customer 1 [Member]      
Disclosure Of Net Sales [Line Items]      
Percentage of entity's revenue 32.00% 28.00% 28.00%
Customer 2 [Member]      
Disclosure Of Net Sales [Line Items]      
Percentage of entity's revenue 13.00% 15.00% 22.00%
Customer 3 [Member]      
Disclosure Of Net Sales [Line Items]      
Percentage of entity's revenue 11.00% 10.00% 22.00%