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SHARE-BASED PAYMENTS - Summary of the activity under the share option scheme (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
SHARE-BASED PAYMENTS |  |
Number of options - Vested and expected | 0 |
2013 Share Option Scheme |  |
SHARE-BASED PAYMENTS |  |
Number of options - Outstanding at beginning | 38,366,108 |
Number of options - Granted | 0 |
Number of options - Forfeited | (1,147,119) |
Number of options - Exercised | (4,363,286) |
Number of options - Outstanding at ending | 32,855,703 | 38,366,108
Number of options - Vested and expected | 32,855,703 |
Number of options - Exercisable | 27,962,196 |
Weighted- average exercise price - Outstanding at beginning | $ 0.07 |
Weighted- average exercise price - Forfeited | 0.07 |
Weighted- average exercise price - Exercised | 0.07 |
Weighted- average exercise price - Outstanding at ending | 0.07 | $ 0.07
Weighted- average exercise price - Vested and expected | 0.07 |
Weighted- average exercise price - Exercisable | 0.07 |
Weighted- average grant- date fair value - Outstanding at beginning | 0.86 |
Weighted- average grant- date fair value - Forfeited | 1.84 |
Weighted- average grant- date fair value - Exercised | 0.63 |
Weighted- average grant- date fair value - Outstanding at ending | 0.85 | $ 0.86
Weighted- average grant- date fair value - Vested and expected | 0.85 |
Weighted- average grant- date fair value - Exercisable | $ 0.68 |
Weighted- average remaining contractual term - Outstanding | 5 years 3 days | 6 years 3 days
Weighted- average remaining contractual term - Vested and expected | 5 years 3 days |
Weighted- average remaining contractual term - Exercisable | 4 years 8 months 4 days |
Aggregate intrinsic value - Outstanding | $ 5,864 | $ 6,972
Aggregate intrinsic value - Vested and expected | 5,864 |
Aggregate intrinsic value - Exercisable | $ 4,994 |

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