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Bank loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Bank loans      
Beginning balance $ 50,000 $ 65,793 $ 55,000
New loans 0 50,000 18,019
Payments (50,000) (65,793) (7,197)
Exchange difference 0 0 (29)
Final balance $ 0 $ 50,000 $ 65,793