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Financial instruments and risk management - Changes in credit loss impairment (Details) - Cash and cash equivalents - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Beginning balance $ 474 $ 447
Write-offs (1,216) (258)
Impairment loss recognized 1,888 285
Ending balance $ 1,146 $ 474