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RESTRICTED NET ASSETS (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Restricted Cash and Cash Equivalents Items        
Appropriation of statutory reserves ¥ 0 ¥ 0 ¥ 0  
Accumulated reserves 10,600,000     $ 1.5
Restricted registered capital 81,000,000     11.7
Amount of restricted net assets ¥ 70,400,000     $ 10.2
Minimum        
Restricted Cash and Cash Equivalents Items        
Percentage of appropriation of statutory reserve from retained earnings after tax profits 10.00%      
Maximum        
Restricted Cash and Cash Equivalents Items        
Percentage of appropriations of statutory reserve of registered capital 50.00%