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Taxation - Unrecognized deferred tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Taxation      
Deductible temporary differences $ 83,933 $ 59,683 $ 25,668
Tax losses 5,900 5,747 5,218
Total unrecognized deferred tax assets 89,833 65,429 30,886
Total tax effect, unrecognized deferred tax assets $ 23,177 $ 16,357 $ 7,722
Applicable tax rate 25.80% 25.00% 25.00%