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Financial instruments - fair values and risk management - Sensitivity analysis (Details) - Currency risk - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]    
Strengthening of USD by 10% 10.00% 10.00%
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% $ (3,938,000) $ (1,749)
Weakening of USD by 10% 10.00% 10.00%
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% $ 3,938,000 $ 1,749
Euro    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% (3,642,000) (1,410,000)
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% 3,642,000 1,410,000
Russian Ruble    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% (296,000) (339,000)
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% $ 296,000 $ 339,000