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SHARE CAPITAL- Summary of warrant activity (Details)
 12 Months Ended
Dec. 18, 2019
$ / shares
Dec. 04, 2018
USD ($)
Dec. 31, 2020
CNY (¥)
$ / shares
Dec. 31, 2019
CNY (¥)
$ / shares
Dec. 31, 2018
CNY (¥)
$ / shares
SHARE CAPITAL          
Outstanding at the beginning | ¥     556,479 247,619  
Exercisable at the beginning | ¥     556,479 247,619  
Granted 0.68 1.18 404,415 420,000  
Exercised | ¥       111,140  
Outstanding at the end | ¥     960,894 556,479 247,619
Exercisable at the end | ¥     960,894 556,479 247,619
Weighted average exercise price of other equity instruments outstanding at beginning of period     $ 4.56 $ 7.74  
Weighted average exercise price of other equity instruments exercisable at beginning of period     4.56 7.74  
Weighted average exercise price, Granted     0.80 2.49  
Weighted average exercise price, Exercised       3.90  
Weighted average exercise price of other equity instruments outstanding at end of period     1.21 4.56 $ 7.74
Weighted average exercise price of other equity instruments exercisable at end of period     $ 1.21 $ 4.56 $ 7.74
Weighted average remaining contractual term, exercisable at the end (in years)     3 years 10 months 6 days 4 years 4 months 17 days 4 years 2 months 9 days
Weighted average remaining contractual term, Granted     5 years 5 years  
Weighted average remaining contractual term, outstanding at the end (in years)     3 years 10 months 6 days 4 years 4 months 17 days 4 years 2 months 9 days