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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
SHARE-BASED COMPENSATION |
Schedule of the RSU activity | ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted Average
​ | ​ | Number of | ​ | Grant-Date
​ | ​ | Shares | ​ | Fair Value
​ | ​ | ​ | ​ | (in whole US dollars)
Unvested at January 1, 2021 |  | 1,888,753 | ​ | 19.78
Granted |  | 2,161,098 | ​ | 26.10
Vested |  | (562,376) | ​ | 17.11
Forfeited |  | (152,172) | ​ | 22.04
Unvested at December 31, 2021 |  | 3,335,303 | ​ | 24.23

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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