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Financial instruments and risk management - Credit loss impairment (Details) - Cash and cash equivalents - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of provision matrix [line items]    
Current financial assets $ 12,660 $ 8,827
Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 1,146 $ 474
Not past due    
Disclosure of provision matrix [line items]    
Expected loss rate 1.30%  
Not past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 90  
1-30 days past due    
Disclosure of provision matrix [line items]    
Expected loss rate 0.20%  
1-30 days past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 4  
31-60 days past due    
Disclosure of provision matrix [line items]    
Expected loss rate 4.50%  
31-60 days past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 56  
61-90 days past due    
Disclosure of provision matrix [line items]    
Expected loss rate 8.00%  
61-90 days past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 55  
91-120 days past due    
Disclosure of provision matrix [line items]    
Expected loss rate 16.00%  
91-120 days past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 96  
Greater than 120 days past due    
Disclosure of provision matrix [line items]    
Expected loss rate 48.80%  
Greater than 120 days past due | Credit loss impairment    
Disclosure of provision matrix [line items]    
Current financial assets $ 845