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Income Taxes - Income tax rates (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income taxes      
Income tax rate 25.00% 25.00% 25.00%
Hong Kong      
Income taxes      
Income tax rate 16.50%    
Hong Kong | First HK$2 million      
Income taxes      
Income tax rate 8.25%    
Hong Kong | In excess of HK$2 million      
Income taxes      
Income tax rate 16.50%    
China      
Income taxes      
Enterprise income tax rate 25.00%    
Preferential tax rate as High and New Technology Enterprises 15.00%