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Income tax (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended | 48 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2018 | Dec. 31, 2026
Income tax |  |  |  |  |
Percentage of tax deduction to tax assessable profits as percentage of qualified R&D expenses | 200.00% | 100.00% | 75.00% | 50.00% |
Deductible tax losses carry forwards | ¥ 2,566,249 |  |  |  |
HONG KONG |  |  |  |  |
Income tax |  |  |  |  |
Statutory income tax rate | 16.50% |  |  |  |
CHINA |  |  |  |  |
Income tax |  |  |  |  |
Statutory income tax rate | 25.00% |  |  |  |
Preferential income tax rate | 15.00% |  |  |  |
CHINA | Kuntong |  |  |  |  |
Income tax |  |  |  |  |
Preferential income tax rate |  |  |  |  | 15.00%

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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