v3.26.1
SHARE-BASED PAYMENTS - Option activities (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2025
CNY (¥)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding          
Number of options, Outstanding, Beginning balance | shares 14,506,693 14,506,693      
Number of options, Forfeited/expired | shares (285,269) (285,269)      
Number of options, Exercised | shares (255,505) (255,505)      
Number of options, Outstanding, Ending balance | shares 13,965,919 13,965,919 14,506,693 14,506,693  
Number of options, Vested and expected to vest | shares 13,965,919 13,965,919      
Number of options, Exercisable | shares 13,531,214 13,531,214      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price.          
Weighted-average exercise price, Outstanding, Beginning balance $ 0.12        
Weighted-average exercise price, Forfeited/expired 0.84        
Weighted-average exercise price, Exercised 0.1        
Weighted-average exercise price, Outstanding, Ending balance 0.11   $ 0.12    
Weighted-average exercise price, Vested and expected to vest 0.11        
Weighted-average exercise price, Exercisable 0.11        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value          
Weighted-average grant-date fair value, Outstanding, Beginning balance 1.02        
Weighted-average grant-date fair value, Forfeited/expired 0.71        
Weighted-average grant-date fair value, Outstanding, Ending balance 1.04   $ 1.02    
Weighted-average grant-date fair value, Vested and expected to vest 1.04        
Weighted-average grant-date fair value, Exercisable $ 1.06        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures          
Weighted-average remaining contractual term, Outstanding (Years) 4 years 10 months 13 days 4 years 10 months 13 days 5 years 10 months 17 days 5 years 10 months 17 days  
Weighted-average remaining contractual term, Vested and expected to vest (Years) 4 years 10 months 13 days 4 years 10 months 13 days      
Weighted-average remaining contractual term, Exercisable (Years) 4 years 9 months 18 days 4 years 9 months 18 days      
Aggregate intrinsic value, Outstanding, Beginning balance | $ $ 3,289        
Aggregate intrinsic value, Exercised 80 ¥ 560   ¥ 95 ¥ 272
Aggregate intrinsic value, Outstanding, Ending balance | $ 4,337   $ 3,289    
Aggregate intrinsic value, Vested and expected to vest | $ 4,337        
Aggregate intrinsic value, Exercisable | $ $ 4,176