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SHARE-BASED AWARDS (Narrative) (Details) $ / shares in Units, ¥ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 18, 2014 $ / shares shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2021 shares | Dec. 31, 2020 shares | Dec. 31, 2022 USD ($) shares
SHARE-BASED AWARDS |  |  |  |  |
Ordinary shares that may be issued |  | 13,218,000 |  |  | 13,218,000
Options granted | 3,479,604 |  |  |  |
Options granted, exercise price | $ / shares | $ 2.04 |  |  |  |
Unrecognized share-based compensation cost | ¥ |  | ¥ 0 |  |  |
Shares exercised |  | 0 | 0 | 0 |
Restricted shares [Member] |  |  |  |  |
SHARE-BASED AWARDS |  |  |  |  |
Unrecognized share-based compensation cost | $ |  |  |  |  | $ 0
Shares vesting description |  | The Restricted Shares have a service condition where the grantees can remove restriction on 25% of total number of restricted shares on annual basis over a four-year period ending the fourth anniversary of the grant date. |  |  |

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