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Income Taxes - Deferred tax assets and deferred tax liabilities (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Net operating loss carry forwards | ¥ 705,249 | ¥ 373,215 |  |
Deductible temporary differences | 72,625 | 31,348 |  |
Deferred revenue | 19,620 | 6,294 |  |
Less: valuation allowance | ¥ (797,494) | (410,857) | ¥ (241,485) | ¥ (136,269)
Deferred tax liabilities |  |  |  |
Identifiable intangible assets from business combination. |  | 439 |  |
Total deferred tax liabilities |  | ¥ 439 |  |

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