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Financial instruments - Allowance of Impairment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Impairment loss allowance $ 0 $ 250
Trade receivables    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets at beginning of period 500 250
Impairment loss allowance 0 250
Allowance account for credit losses of financial assets at end of period $ 500 $ 500