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Summary of Significant Accounting Policies - Fair value measurements (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of short term investments | ¥ 30,158 | ¥ 52,252 | ¥ 26,351
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Short-term investments | ¥ 857,924 | ¥ 945,865 |

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