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SHARE BASED COMPENSATION - Restricted stock (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Nov. 22, 2018
$ / shares
shares
May 18, 2015
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
Restricted stock            
Shares converted (in shares) 293,059          
Exercise price (per share) | $ / shares $ 0.4749          
Share-based compensation expense     $ 145 ¥ 947 ¥ 1,624 ¥ 8,121
Unrecognized share-based compensation expenses | ¥       1,666 2,720  
General and administrative            
Restricted stock            
Share-based Compensation     $ 145 ¥ 947 ¥ 1,624 ¥ 8,121
Restricted stock [Member]            
Restricted stock            
Issued (in shares)     (50,001) (50,001) (101,910)  
Shares converted (in shares) 293,059          
Exercise price (per share) | $ / shares $ 0.4749          
Restricted stock [Member] | Non-executive member of board            
Restricted stock            
Issued (in shares)     0 0 47,743  
Restricted stock [Member] | Employees            
Restricted stock            
Granted (in shares)   510,000        
Restricted stock [Member] | Employee and new hires            
Restricted stock            
Vesting percentage   25.00%        
Vested (in shares)     0 0 47,743  
Restricted stock [Member] | Senior employee            
Restricted stock            
Granted (in shares) 200,000          
Vesting percentage 25.00%          
Vested (in shares)     50,001 50,001 54,167