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Income taxes - General (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income taxes |  |  |
Statutory Tax rate | 25.00% | 25.00% | 25.00%
Hong Kong | first HK$2 million of assessable profits earned first HK$2 million of assessable profits earned |  |  |
Income taxes |  |  |
Statutory Tax rate | 8.25% |  |
Hong Kong | after first HK$2 million of assessable profits earned |  |  |
Income taxes |  |  |
Statutory Tax rate | 16.50% |  |
PRC |  |  |
Income taxes |  |  |
Statutory Tax rate | 25.00% |  |
Preferential income tax rate | 15.00% |  |
High and new technology enterprise certificate term | 3 years |  |

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