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SHARE-BASED COMPENSATION - Fair value of share options granted (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
SHARE-BASED COMPENSATION    
Expected dividend yield 0.00% 0.00%
Fair value per option granted 0.79 to 1.14 0.82 to 1.10
Bottom of Range    
SHARE-BASED COMPENSATION    
Risk-free interest rate 3.68% 1.44%
Expected stock price volatility 65.75% 73.80%
Expected life 3 years 4 months 28 days 3 years 4 months 13 days
Top of Range    
SHARE-BASED COMPENSATION    
Risk-free interest rate 4.70% 4.07%
Expected stock price volatility 73.41% 76.78%
Expected life 3 years 5 months 4 days 3 years 5 months 1 day