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Income taxes - Unrecognized tax losses (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses $ 31,363
2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 98
2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 2,372
2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,388
2039  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,660
2040  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,843
Indefinite  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 12,002
Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 19,361
Canada | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 98
Canada | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 2,372
Canada | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,388
Canada | 2039  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,660
Canada | 2040  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 5,843
Canada | Indefinite  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 11,239
Italy | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy | 2039  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy | 2040  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
Italy | Indefinite  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 11,239
France  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 763
France | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
France | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
France | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
France | 2039  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
France | 2040  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses 0
France | Indefinite  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Total unrecognized tax losses $ 763