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Trade and other payables - Movement of dividends payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade and other payables      
Beginning balance $ 638 $ 604 $ 663
Declared dividends to controlling shareholders, note 17(d)     22,098
Dividends paid to controlling shareholders, note 17(d)     (22,098)
Declared dividends to non-controlling shareholders, note 17(d) 6,160 5,140 6,500
Dividends paid to non-controlling shareholders, note 17(d) (6,160) (5,140) (6,500)
Expired dividends, note 17(c) (76) (26) (53)
Other 5 60 (6)
Ending balance $ 567 $ 638 $ 604