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TAXATION (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
TAXATION              
Applicable tax rates 25.00% 25.00% 25.00% 25.00% 25.00%    
Current income tax for federal and state for US Proton ¥ 700 $ 100 ¥ (2,183,000)   ¥ 404,000    
Withholding tax rate 10 10          
Net operating loss carryforwards ¥ 2,367,847,000         $ 338,598,000  
Unrecognized tax benefits 76,215,000   67,799,000   63,899,000 10,898,000 $ 9,695,000
Unrecognized tax benefits, net deferred tax asset related to tax loss carryforwards 34,832,000   32,728,000     4,981,000  
Unrecognized tax benefits which affect the annual effective tax rate 45,385,000   36,036,000     6,490,000  
Uncertain tax position, impact on taxes 163,000 $ 23,000 (2,473,000)   ¥ (6,121,000)    
Accrued interest and penalties ¥ 10,315,000   ¥ 9,433,000     $ 1,475,000  
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