v3.26.1
SHARE-BASED COMPENSATION - Share Option Activities (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Number of Options        
Outstanding at the beginning 12,416,354 9,847,240 9,847,240  
Granted (in shares) 3,136,333 3,424,440    
Exercised (in shares) (326,933) (3,250)    
Forfeited (in shares) (105,000) (442,646)    
Outstanding at the end 15,120,754 12,825,784 12,416,354 9,847,240
Vested and expected to vest at the end 15,120,754      
Exercisable at the end 7,301,789 4,863,411    
Weighted Average Exercise Price        
Outstanding at the beginning (in dollars per share) $ 2.2 $ 2.55 $ 2.55  
Granted (in dollars per share) 2.1 1.41    
Exercised (in dollars per share) 1.27 1.08    
Forfeited (in dollars per share) 1.96 3.11    
Outstanding at the end (in dollars per share) 2.2 2.23 2.2 $ 2.55
Vested and expected to vest at the end (in dollars per share) 2.2      
Exercisable at the end (in dollars per share) 2.76 3.49    
Weighted Average Grant Date Fair Value        
Outstanding at the beginning (in dollars per share) 1.91 2.49 2.49  
Granted (in dollars per share) 1.36 0.88    
Exercised (in dollars per share) 1.68 0.66    
Forfeited (in dollars per share) 1.25 2.12    
Outstanding at the end (in dollars per share) 1.8 2.07 $ 1.91 $ 2.49
Vested and expected to vest at the end (in dollars per share) 1.8      
Exercisable at the end (in dollars per share) $ 2.57 $ 3.96    
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value        
Outstanding (in years) 7 years 11 months 26 days 8 years 4 months 24 days 8 years 10 days 8 years 4 months 9 days
Vested and expected to vest at the end (in years) 7 years 11 months 26 days      
Exercisable at the end (in years) 7 years 7 days 6 years 10 months 9 days    
Outstanding at the beginning (in dollars) $ 1,660,307 $ 1,736,202 $ 1,736,202  
Outstanding at the end (in dollars) 25,196,630 2,046,458 $ 1,660,307 $ 1,736,202
Vested and expected to vest at the end (in dollars) 25,196,630      
Exercisable at the end (in dollars) $ 12,010,060 $ 759,771