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SHARE-BASED AWARDS (Narrative) (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
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