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Principal Accounting Policies - Statutory reserves (Details) - PRC
12 Months Ended
Dec. 31, 2023
General reserve fund  
Statutory reserves  
Required minimum percentage of annual appropriations 10.00%
Statutory threshold percentage of the reserve fund to the registered capital of the respective company, above which the appropriation is not required 50.00%
Statutory surplus reserve  
Statutory reserves  
Required minimum percentage of annual appropriations 10.00%
Statutory threshold percentage of the reserve fund to the registered capital of the respective company, above which the appropriation is not required 50.00%