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SHARE-BASED COMPENSATION - Share option activities (Details) - Amended 2016 Plan and 2018 Plan - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of share      
Outstanding, at beginning of period (in shares) 4,414,608    
Granted (in shares) 0 0 0
Exercised (in shares) (464,300)    
Forfeited/Expired (in shares) (7,250)    
Outstanding, at end of period (in shares) 3,943,058 4,414,608  
Exercisable, at end of period (in shares) 3,943,058    
Weighted average exercise price      
Outstanding, at beginning of period (in dollars per share) $ 2.11    
Exercised (in dollars per share) 0.20    
Forfeited/Expired (in dollars per share) 0.20    
Outstanding, at end of period (in dollars per share) 2.34 $ 2.11  
Exercisable, at end of period (in dollars per share) $ 2.34    
Additional disclosures      
Weighted remaining contractual years, Outstanding at end of period 4 years 6 months 21 days    
Weighted remaining contractual years, Exercisable at end of period 4 years 6 months 21 days    
Aggregate intrinsic value, Outstanding at end of period $ 1,190,466    
Aggregate intrinsic value, Exercisable at end of period $ 1,190,466