v3.26.1
INCOME TAXES - Summary of reconciliation of effective tax rate and statutory income tax rate (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income/(loss) before provision for income tax and share of results of equity investees ¥ (327,418) $ (46,820) ¥ (1,040,322) ¥ 12,524
Income tax (expense)/ benefits computed at an applicable tax rate of 25% 81,855   260,081 (3,131)
Effect of changes in tax laws or rates enacted in the current year 0      
Effect of cross-border tax laws 0      
Change in valuation allowance 13,493   (219,272) (46,054)
Non-taxable income 0      
Non-deductible expenses (4,390)      
Share-based compensation expenses (2,446)      
Others (1,944)      
Changes in unrecognized tax benefits 0      
Effect of permanent differences     (34,587) (27,346)
Effect of research and development super-deduction 31,596   52,705 44,935
Effect of preferential tax rate 114,066   (67,850) 17,480
Effect on tax rates in different tax jurisdictions     291 3,459
Others 1,688      
Income tax benefits/(expenses) ¥ 4,111 $ 588 ¥ (8,632) ¥ (10,657)
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Income tax rate 25.00% 25.00% 25.00% 25.00%
Effect of changes in tax laws or rates enacted in the current year 0.00% 0.00%    
Effect of cross-border tax laws 0.00% 0.00%    
Change in valuation allowance (4.10%) (4.10%)    
Non-taxable income 0.00% 0.00%    
Non-deductible expenses (1.30%) (1.30%)    
Share-based compensation expenses (0.70%) (0.70%)    
Others (0.60%) (0.60%)    
Changes in unrecognized tax benefits 0.00% 0.00%    
Effect of preferential tax rate (34.90%) (34.90%)    
Effect of research and development super-deduction 9.70% 9.70%    
Others 0.50% 0.50%    
Income tax expenses, percent total 1.30% 1.30%    
Chinese Mainland        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income/(loss) before provision for income tax and share of results of equity investees ¥ (411,103)   ¥ (1,040,744) ¥ 2,277
Income tax benefits/(expenses) 4,111      
Non-Chinese Mainland        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income/(loss) before provision for income tax and share of results of equity investees 83,685   ¥ 422 ¥ 10,247
Income tax benefits/(expenses) 0      
Cayman Islands        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effect on tax rates in different tax jurisdictions ¥ (19,915)      
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Foreign Tax Effects 6.10% 6.10%    
Hong Kong        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effect on tax rates in different tax jurisdictions ¥ (1,067)      
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Foreign Tax Effects 0.30% 0.30%    
Other Foreign Jurisdictions        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effect on tax rates in different tax jurisdictions ¥ 61      
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Foreign Tax Effects (0.00%) (0.00%)