v3.26.1
SHARE-BASED COMPENSATION - Share option activities (Details) - Amended 2016 Plan and 2018 Plan - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Number of share    
Outstanding, at beginning of period (in shares) 3,753,328  
Exercised (in shares) (115,220)  
Expired (in shares) (140)  
Outstanding, at end of period (in shares) 3,637,968 3,753,328
Exercisable, at end of period (in shares) 3,637,968  
Weighted average exercise price    
Outstanding, at beginning of period (in dollars per share) $ 2.45  
Exercised (in dollars per share) 0.2  
Expired (in dollars per share) 0.2  
Outstanding, at end of period (in dollars per share) 2.52 $ 2.45
Exercisable, at end of period (in dollars per share) $ 2.52  
Additional disclosures    
Weighted remaining contractual years, Outstanding at end of period 2 years 8 months 19 days 3 years 7 months 24 days
Weighted remaining contractual years, Exercisable at end of period 2 years 8 months 19 days  
Aggregate intrinsic value, Outstanding at end of period $ 1,347,928 $ 792,578
Aggregate intrinsic value, Exercisable at end of period $ 1,347,928