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SHARE-BASED AWARDS (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |
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Oct. 02, 2018 shares | Sep. 13, 2017 shares | Aug. 08, 2017 shares | Aug. 07, 2017 shares | Aug. 01, 2014 shares | Jul. 01, 2014 shares | Feb. 18, 2014 $ / shares shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2021 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost |  |  |  |  |  |  |  | ¥ 8,391 |  |  | $ 1,301
Shares granted | 5,992,605 | 45,000 | 3,319,200 | 1,453,950 | 69,564 | 21,132 | 1,370,250 |  |  |  |
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. |  |  |
Weighted-average vesting period over which deferred cost is expected to be recognized |  |  |  |  |  |  |  | 4 months 24 days |  |  |

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