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TAXATION (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
TAXATION                  
Applicable tax rates   25.00% 25.00% 25.00% 25.00% 25.00%      
Current income tax for federal and state for US Proton   ¥ (2,183) $ (299) ¥ 404 ¥ 196        
Withholding tax rate   10 10            
Net operating loss carryforwards   ¥ 2,164,982           $ 296,601  
Unrecognized tax benefits   67,799   63,899 67,172     9,287 $ 8,754
Unrecognized tax benefits, net deferred tax asset related to tax loss carryforwards   32,728   28,712       4,484  
Unrecognized tax benefits which affect the annual effective tax rate   36,036   35,421       4,937  
Uncertain tax position, impact on taxes   2,473 $ 339 6,121 ¥ 7,254        
Accrued interest and penalties   ¥ 9,433   ¥ 9,283       $ 1,292  
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%      
Singapore                  
TAXATION                  
Income tax profits | $           $ 0 $ 0    
Hong Kong                  
TAXATION                  
Income tax profits | ¥   ¥ 0