v3.26.1
Taxation - Reconciliation between the statutory rate and the effective tax rate (Details)
¥ in Thousands, $ in Thousands
12 Months Ended 24 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
Reconciliation, Amount          
PRC Statutory Tax Rate: ¥ (43,368)   ¥ (48,003) ¥ (206,902)  
Foreign Tax Effects (20,185)        
Statutory tax rate difference     (23,568) (20,216)  
Effect of preferential tax rate     (27,031) (98,329)  
Changes in Valuation Allowances 24,748   127,354 237,414  
Nontaxable or Nondeductible Items 60,492   (92,205) [1] (96,793) [1]  
Research and development credits (14,231)        
Tax holidays 31,734        
Share-based payment awards 15,440        
Goodwill impairment 27,020        
Other 529        
Income tax expenses/(benefits) ¥ 21,687 $ 3,101 ¥ (9,391) ¥ 11,832  
Tax Jurisdiction of Domicile [Extensible Enumeration] China China      
Reconciliation, Percent          
PRC Statutory Tax Rate: 25.00% 25.00%     25.00%
Foreign Tax Effects 11.70% 11.70%      
Changes in Valuation Allowances (14.30%) (14.30%)      
Nontaxable or Nondeductible Items (34.90%) (34.90%)      
Research and development credits 8.20% 8.20%      
Tax holidays (18.30%) (18.30%)      
Share-based payment awards (8.90%) (8.90%)      
Goodwill impairment (15.60%) (15.60%)      
Other (0.30%) (0.30%)      
Effective Tax Rate (12.50%) (12.50%)      
Cayman Islands          
Reconciliation, Amount          
Foreign Tax Effects ¥ (6,733)        
Statutory tax rate difference ¥ (6,733)        
Reconciliation, Percent          
Foreign Tax Effects 3.90% 3.90%      
Statutory tax rate difference 3.90% 3.90%      
Hong Kong          
Reconciliation, Amount          
Foreign Tax Effects ¥ (15,748)        
Statutory tax rate difference (5,223)        
Non-taxable income ¥ (10,525)        
Reconciliation, Percent          
Foreign Tax Effects 9.10% 9.10%      
Statutory tax rate difference 3.00% 3.00%      
Non-taxable income 6.10% 6.10%      
Other foreign jurisdictions          
Reconciliation, Amount          
Other Adjustments ¥ 2,296        
Reconciliation, Percent          
Other Adjustments (1.30%) (1.30%)      
[1] The permanent differences mainly consist of additional deduction for research and development expenditures and non-deductible expenses.