v3.25.2
SHARE-BASED COMPENSATION - Schedule of assumptions of share options granted (Details) - Options - $ / shares
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
SHARE-BASED COMPENSATION    
Risk-free interest rate, Minimum 4.20% 4.46%
Risk-free interest rate, Maximum 4.53% 4.58%
Expected volatility, Minimum 55.58% 54.06%
Expected volatility, Maximum 56.22% 54.57%
Expected dividend yield 0.00% 0.00%
Expected terms 10 years 10 years
Minimum    
SHARE-BASED COMPENSATION    
Exercise multiple 2.2 2.2
Fair value of underlying ordinary share $ 1.87 $ 5.78
Maximum    
SHARE-BASED COMPENSATION    
Exercise multiple 2.8 2.8
Fair value of underlying ordinary share $ 3.61 $ 9.81