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SHARE CAPITAL- Summary of warrant activity (Details)
 6 Months Ended 12 Months Ended
Jun. 14, 2021
$ / shares
Feb. 17, 2021
Jun. 30, 2021
CNY (¥)
$ / shares
Dec. 31, 2020
CNY (¥)
$ / shares
SHARE CAPITAL        
Outstanding at the beginning | ¥     980,894  
Exercisable at the beginning | ¥     980,894  
Granted 3.15 4.45 1,652,322  
Exercised | ¥     700,516  
Expired | ¥     64,286  
Outstanding at the end | ¥     1,868,414 980,894
Exercisable at the end | ¥     1,809,590 980,894
Weighted average exercise price of other equity instruments outstanding at beginning of period     $ 1.21  
Weighted average exercise price of other equity instruments exercisable at beginning of period     1.21  
Weighted average exercise price, Granted     3.56  
Weighted average exercise price, Exercised     2.43  
Weighted average exercise price, Expired     18.72  
Weighted average exercise price of other equity instruments outstanding at end of period     4.00 $ 1.21
Weighted average exercise price of other equity instruments exercisable at end of period     $ 3.99 $ 1.21
Weighted average remaining contractual term, exercisable at the end (in years)     4 years 5 months 23 days 3 years 10 months 6 days
Weighted average remaining contractual term, Granted     5 years  
Weighted average remaining contractual term, outstanding at the end (in years)     4 years 5 months 26 days 3 years 10 months 6 days