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Other operating expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Net impairment loss on trade receivables $ 54 $ 60
Impairment loss allowance 0 250
Impairment loss on trade receivables 54 310
Restructuring costs 156 66
Acquisition related costs (note 7) 2,115 0
Other operating expense $ 2,325 $ 376