v3.26.1
SHARE-BASED COMPENSATION - Share Option Activities (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Number of Options        
Outstanding at the beginning 9,847,240 8,766,882 6,286,912  
Granted (in shares) 3,624,440 3,925,945 3,442,500  
Exercised (in shares) (86,469) (185,620) (10,000)  
Forfeited (in shares) (968,857) (483,022) (952,530)  
Cancelled (in shares)   (2,176,945)    
Outstanding at the end 12,416,354 9,847,240 8,766,882 6,286,912
Vested and expected to vest at the end 12,416,354      
Exercisable at the end 5,319,029 3,440,384    
Weighted Average Exercise Price        
Outstanding at the beginning (in dollars per share) $ 2.55 $ 3.39 $ 4.8  
Granted (in dollars per share) 1.4 1.68 1.14  
Exercised (in dollars per share) 0.94 1.02 0.55  
Forfeited (in dollars per share) 2.95 6.13 4.59  
Cancelled (in dollars per share)   3.68    
Outstanding at the end (in dollars per share) 2.2 2.55 3.39 $ 4.8
Vested and expected to vest at the end (in dollars per share) 2.2      
Exercisable at the end (in dollars per share) 3.21 4.27    
Weighted Average Grant Date Fair Value        
Outstanding at the beginning (in dollars per share) 2.49 3.6 5.16  
Granted (in dollars per share) 0.87 1.04 0.72  
Exercised (in dollars per share) 0.98 2.49 5.72  
Forfeited (in dollars per share) 4.03 4.28 3.45  
Cancelled (in dollars per share)   3.96    
Outstanding at the end (in dollars per share) 1.91 2.49 $ 3.6 $ 5.16
Vested and expected to vest at the end (in dollars per share) 1.91      
Exercisable at the end (in dollars per share) $ 3.24 $ 5.15    
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value        
Outstanding (in years) 8 years 10 days 8 years 4 months 9 days 8 years 2 months 26 days 8 years 5 months 8 days
Vested and expected to vest at the end (in years) 8 years 10 days      
Exercisable at the end (in years) 6 years 10 months 20 days 6 years 5 months 26 days    
Outstanding at the beginning (in dollars) $ 1,736,202 $ 2,011,843 $ 94,990  
Outstanding at the end (in dollars) 1,660,307 1,736,202 $ 2,011,843 $ 94,990
Vested and expected to vest at the end (in dollars) 1,660,307      
Exercisable at the end (in dollars) $ 759,799 $ 616,539