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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
Dec. 31, 2024
CNY (¥)
segment
Dec. 31, 2023
CNY (¥)
segment
Dec. 31, 2022
CNY (¥)
Employee benefits      
Employee social security and welfare benefits ¥ 36,640 ¥ 45,940 ¥ 43,960
Taxation      
Unrecognized Tax Benefits ¥ 0 ¥ 0 0
Segment Information      
Number of operating segments | segment 1 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 ¥ 20 ¥ 540 550
Government grant 491 1,147 3,447
Sales and marketing expenses      
Sales and marketing expenses      
Total advertising expenses ¥ 2,340 ¥ 4,900 ¥ 4,800