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SUBSEQUENT EVENTS (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 6 Months Ended
Jun. 14, 2021
Feb. 17, 2021
Feb. 12, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
CNY (¥)
Jun. 30, 2020
CNY (¥)
SUBSEQUENT EVENTS          
Value of shares to be issued | ¥       ¥ 29,977 ¥ 8,088
Aggregate the number of share sale | shares     588,235    
Warrants to purchase shares of common stock | shares     588,235    
Gross Proceeds from pricing of public offering | $     $ 2,100    
Warrants term 5 years 5 years 5 years    
Warrants exercise price per share | $ / shares     $ 4.46    
Net proceeds for sale of common shares and warrants after deducting certain fees due to the placement agent and the Company's estimated transaction expenses | $     $ 1,860    
Percentage of aggregate number of shares sold in offering     5.00%