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SHARE CAPITAL- Classes of Share Capital (Details)
¥ in Thousands, $ in Thousands
 2 Months Ended 12 Months Ended
Feb. 28, 2019
CNY (¥)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
CNY (¥)
shares
Disclosure Of SHARE CAPITAL [Line Items]          
Number of shares authorised   50,000,000   50,000,000  
Issued capital ¥ 306 $ 58,000 ¥ 397 [1]   ¥ 306
Issuance of new shares | ¥     181   67
Warrants exercised into shares | ¥         1,716
Equity compensation | ¥     13   5
Issued capital   91,000 ¥ 591 [2] $ 58,000 ¥ 397 [1]
Value of Shares authorised | $   $ 1,200   $ 1,200  
Balance 5,678,703 2,435,662 2,435,662 5,678,703 5,678,703
Issuance of new shares (in shares)   1,156,251   1,200,000  
Warrants exercised into shares (in shares) 333,420        
Equity compensation (in shares)   82,457 82,457 94,862 94,862
Ending Balance (in shares)   3,674,370 3,674,370 2,435,662 2,435,662
Share capital [member]          
Disclosure Of SHARE CAPITAL [Line Items]          
Warrants exercised into shares | ¥     ¥ 0   ¥ 19
Warrants exercised into shares (in shares)   0 0 333,420 333,420
[1] (1) Equivalent to US$58,000
[2] (2) Equivalent to US$91,000* reflect 3:1 reverse stock split