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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, 2020
CNY (¥)
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Dec. 31, 2020
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               ¥ 25,689         $ 3,937
Shares granted 5,992,605 45,000 3,319,200 1,453,950 69,564 21,132 1,370,250       0 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.          
Weighted-average vesting period over which deferred cost is expected to be recognized               1 year 2 months 1 day