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Related parties (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2019
Mar. 31, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Related Party Transaction [Line Items]            
Percent of gross sales due to related parties   2.00%       2.00%
Royalty expense     $ 17 $ 25 $ 20  
Royalties payable     $ 3 $ 3 4  
Affiliated entity            
Related Party Transaction [Line Items]            
License fees received         $ 32  
Subsequent Event            
Related Party Transaction [Line Items]            
Royalty agreement term 20 years          
Subsequent Event | Royalty agreement first ten years            
Related Party Transaction [Line Items]            
Percent of gross sales due to related parties 2.00%          
Subsequent Event | Royalty agreement next ten years            
Related Party Transaction [Line Items]            
Percent of gross sales due to related parties 1.00%