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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
SHARE-BASED COMPENSATION |
Summary of the Group's nonvested restricted stock activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average Grant
​ | ​ | Number of Restricted | ​ | Date
​ |  | Stocks |  | Fair Value
​ | ​ |  | ​ | US$
Nonvested restricted stocks outstanding at January 1, 2021 |  | 70,954,080 |  | 1.18
Granted | ​ | 2,163,420 | ​ | 4.20
Forfeited | ​ | (4,607,340) | ​ | 1.64
Vested | ​ | (12,325,470) | ​ | 1.58
Adjusted for performance conditions | ​ | (2,488,200) | ​ | 0.61
Nonvested restricted stocks outstanding at December 31, 2021 | ​ | 53,696,490 | ​ | 1.20

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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