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Intangible assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Composition and movement of intangible assets      
Beginning balance $ 12,725    
Ending balance 16,219 $ 12,725  
Software      
Composition and movement of intangible assets      
Beginning balance 12,725 12,632  
Additions 10,387 6,790  
Amortization (6,895) (6,696)  
Exchange differences 2 (1)  
Ending balance 16,219 12,725 $ 12,632
Amortization expense 6,895 6,696 $ 6,752
Software | Gross value      
Composition and movement of intangible assets      
Beginning balance 47,850    
Ending balance 58,281 47,850  
Software | Accumulated amortization      
Composition and movement of intangible assets      
Beginning balance (35,125)    
Ending balance $ (42,062) $ (35,125)  
Software | Minimum      
Composition and movement of intangible assets      
Estimated useful lives (in years) 1 year    
Software | Maximum      
Composition and movement of intangible assets      
Estimated useful lives (in years) 4 years