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SHARE-BASED COMPENSATION - Share Options (Details) - $ / shares |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2019 | Dec. 31, 2018 | Oct. 31, 2014 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Summary of the stock option activity, Options granted share Number: |  |  |  |  |  |
Outstanding at end of year (in shares) |  |  |  | 1,148,002 |  |
Summary of the stock option activity, Weighted average exercise price per option: |  |  |  |  |  |
Outstanding at end of year (in dollars per share) |  |  |  | $ 0.6483 |  |
Employee Stock Option |  |  |  |  |  |
Summary of the stock option activity, Options granted share Number: |  |  |  |  |  |
Exercised (in shares) |  |  |  | (1,510,880) | (3,944,400) | (2,560,304)
Employee Stock Option | Minimum |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Vesting period (in years) |  |  | 4 years | 4 years |  |
Employee Stock Option | Maximum |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Vesting period (in years) |  |  | 5 years | 5 years |  |
2014 Share Incentive Plan | Employee Stock Option |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Maximum number of shares under the plan |  |  | 135,032,132 |  |  |
Expire period |  |  | 10 years |  |  |
Modification of exercise price of number of stock options granted | 8,113,145 |  |  |  |  |
Modified of exercise price of stock options granted | $ 0.6 |  |  |  |  |
2019 Share Incentive Plan | Employee Stock Option | Maximum |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Maximum percentage of shares available for issuance, based on total number of shares issued and outstanding on September 29, 2019 |  | 2.00% |  |  |  |
Maximum percentage of number of shares increased in each year |  | 2.00% |  |  |  |
Maximum percentage of aggregate number of shares initially reserved and subsequently increased during the term of the total number of shares issued and outstanding on September 29 |  | 8.00% |  |  |  |
2014 Share Incentive Plan and 2019 share Incentive Plan | Employee Stock Option |  |  |  |  |  |
Summary of the stock option activity, Options granted share Number: |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  |  | 2,658,882 | 7,259,362 | 9,986,146
Exercised (in shares) |  |  |  | (1,510,880) | (3,944,400) | (2,560,304)
Granted (in shares) |  |  |  | 0 | 0 | 128,000
Cancelled/Forfeited (in shares) |  |  |  |  | (656,080) | (294,480)
Outstanding at end of year (in shares) |  |  |  | 1,148,002 | 2,658,882 | 7,259,362
Summary of the stock option activity, Weighted average exercise price per option: |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) |  |  |  | $ 0.648 | $ 0.5533 | $ 0.5556
Exercised (in dollars per share) |  |  |  | 0.6477 | 0.5205 | 0.5574
Granted (in dollars per share) |  |  |  |  |  | 0.65
Cancelled/forfeited (in dollars per shares) |  |  |  |  | 0.3667 | 0.6368
Outstanding at end of year (in dollars per share) |  |  |  | $ 0.6483 | $ 0.648 | $ 0.5533

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