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TAXATION (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
TAXATION                    
Applicable tax rates   25.00% 25.00% 25.00% 25.00% 25.00% 25.00%      
Current income tax for federal and state for US Proton   ¥ 404 $ 57 ¥ 196   ¥ 362        
Withholding tax rate   10 10              
Net operating loss carryforwards   ¥ 1,703,345             $ 239,911  
Unrecognized tax benefits   63,899   67,172   81,901     9,000 $ 9,461
Unrecognized tax benefits, net deferred tax asset related to tax loss carryforwards   28,712   19,962         4,044  
Unrecognized tax benefits which affect the annual effective tax rate   35,421   39,412         4,989  
Uncertain tax position, impact on taxes   6,121 $ 862 7,254   ¥ 12,918        
Accrued interest and penalties   ¥ 9,283   ¥ 13,091         $ 1,307  
Property leasing arrangement                    
TAXATION                    
Value added tax 13.00%                  
Technical service                    
TAXATION                    
Value added tax   6.00% 6.00%              
United States                    
TAXATION                    
Applicable tax rates   21.00% 21.00% 21.00% 21.00% 21.00% 21.00%      
Singapore                    
TAXATION                    
Income tax profits | $         $ 0   $ 0 $ 0    
Hong Kong                    
TAXATION                    
Income tax profits | ¥   ¥ 0