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SHARE BASED COMPENSATION EXPENSES - Stock option activity (Details) - 12 months ended Dec. 31, 2025
¥ in Thousands
$ / shares
shares
CNY (¥)
shares
Shares    
Outstanding at the beginning | shares 16,447,636  
Granted | shares 3,260,697  
Exercised | shares (12,011,093)  
Forfeited | shares (506,183)  
Outstanding at the end | shares 7,191,057  
Vested and expected to be vested at the end | shares   7,191,057
Exercisable at the end | shares   1,161,113
Weighted average exercise price    
Outstanding at the beginning | $ / shares $ 1.2316  
Granted | $ / shares 3.6414  
Exercised | $ / shares 0.3329  
Forfeited | $ / shares 3.698  
Outstanding at the end | $ / shares 3.6518  
Vested and expected to be vested at the end | $ / shares 3.6518  
Exercisable at the end | $ / shares $ 2.67  
Additional disclosure    
Weighted-average remaining contractual term, Outstanding 8 years 10 months 6 days  
Weighted average remaining contractual term, Vested and expected to be vested at the end 8 years 10 months 6 days  
Weighted average remaining contractual term, exercisable at the end 8 years 7 months 17 days  
Aggregate intrinsic value, Outstanding | ¥   ¥ 406,622
Aggregate intrinsic value, Vested and expected to be vested at the end | ¥   406,622
Aggregate intrinsic value, Exercisable at the end | ¥   ¥ 73,125