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Income Taxes - Components of loss before tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes      
Total loss before tax $ (57,066) $ (144,295) $ (174,934)
PRC entities      
Income Taxes      
Total loss before tax (71,249) (143,951) (150,478)
Overseas entities      
Income Taxes      
Total loss before tax $ 14,183 $ (344) $ (24,456)