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Income Taxes - Income tax rates (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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% |  |
PRC |  |  |
Income taxes |  |  |
Enterprise income tax rate | 25.00% |  |
Preferential tax rate as High and New Technology Enterprises | 15.00% |  |

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