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Significant Accounting Policies - Sales and marketing expenses, Employee Benefits, Government grant, Segment Reporting and Statutory Reserves (Details) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) segment | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Employee benefits |  |  |
Employee social security and welfare benefits | ¥ 45,940 | ¥ 43,960 | ¥ 36,410
Taxation |  |  |
Unrecognized Tax Benefits | ¥ 0 | 0 | 0
Segment Reporting |  |  |
Number of reportable segments | segment | 1 |  |
Statutory Reserves |  |  |
Percentage of general reserve fund, annual after-tax profits | 10.00% |  |
Maximum percentage of general reserve fund, registered capital | 50.00% |  |
Percentage of statutory surplus fund, annual after-tax profits | 10.00% |  |
Maximum percentage of statutory surplus fund, registered capital | 50.00% |  |
Profit appropriation to reserve funds | ¥ 540 | 550 | 300
Government grant | 1,147 | 3,447 | 3,304
Sales and marketing expenses |  |  |
Sales and marketing expenses |  |  |
Total advertising expenses | ¥ 4,900 | ¥ 4,800 | ¥ 7,270

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