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Financial instruments and risk management - Sensitivity analysis for foreign currency risk (Details) - Foreign currency risk - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, percent 1.00%  
Reasonably possible decrease in risk variable, percent 1.00%  
Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss $ 15 $ 0
CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 2,597 314
Cash and cash equivalents | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 8 1
Cash and cash equivalents | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 2,579 298
Trade and other receivables | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 8 7
Trade and other receivables | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 21 16
Trade and other payables | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss (1) (8)
Trade and other payables | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss (3) 0
Borrowings | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss 0 0
Borrowings | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, impact on net loss $ 0 $ 0