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Bank borrowings - Maturity of bank borrowings (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Maturity of bank borrowings
Within 1 year	$ 2,876
Between 1 to 2 years	3,207
Between 2 to 3 years	2,613
Between 3 to 4 years	2,128
Between 4 to 5 years	1,733
Beyond 5 years	$ 7,610

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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