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Related party transactions - Key Management Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of transactions between related parties [line items]
Maximum obligation, notice period (months)	12 months
Maximum obligation, notice period per each year (months)	1 month
Number of years due to change in control	2 years
Payment equivalent period (months)	24 months
Salaries and employee benefits	$ 3,767	$ 3,021
Post-employment retirement benefits	74	62
Share-based compensation (note 21)	2,411	1,530
Key management personnel compensation	$ 6,252	$ 4,613
Maximum
Disclosure of transactions between related parties [line items]
Maximum obligation, notice period per each year (months)	24 months

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Key Management Personnel Compensation, Due To Change In Control, Payment Equivalent Period

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

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