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Provisions and other non-current liabilities - Additional information (Details)
$ in Thousands
 12 Months Ended 60 Months Ended
Jun. 25, 2020
USD ($)
Jun. 23, 2020
numberOfCases
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
complaint
Disclosure of other provisions [line items]            
Number of legal cases filed against company | complaint           50
Claims of US Patents [Member]            
Disclosure of other provisions [line items]            
Number of patents allegedly infringed   12        
Claims of European Patents [Member]            
Disclosure of other provisions [line items]            
Number of patents allegedly infringed   1        
Warranty, governmental investigations and other legal proceedings provisions [member]            
Disclosure of other provisions [line items]            
Term of deferred prosecution agreement 3 years          
Additions to provisions | $ $ 8,925   $ 9,000 $ 0 $ 1,000