v3.26.3
SHARE-BASED COMPENSATION - Schedule of share options activities (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Number of shares    
Outstanding, Beginning balance 12,051,138  
Granted 3,823,185  
Forfeited (1,203,162)  
Exercised 0 0
Outstanding, Ending balance 14,671,161 12,051,138
Vested and expected to vest 14,671,161  
Exercisable 14,649,013  
Weighted average exercise price    
Outstanding, Beginning balance $ 2.89  
Granted 2.89  
Forfeited 2.89  
Outstanding, Ending balance 2.89 $ 2.89
Vested and expected to vest 2.89  
Exercisable 2.89  
Weighted average grant-date fair value    
Outstanding, Beginning balance 2.05  
Granted 0.43  
Forfeited 2.03  
Outstanding, Ending balance 1.65 $ 2.05
Vested and expected to vest 1.65  
Exercisable $ 1.64  
Weighted remaining contractual years    
Weighted remaining contractual years 7 years 11 months 19 days 7 years 9 months 14 days
Vested and expected to vest 7 years 11 months 19 days  
Exercisable 7 years 11 months 19 days