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CONVERTIBLE NOTES - Summary of Convertible Notes Outstanding (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Sep. 30, 2025
USD ($)
Feb. 28, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Nov. 30, 2023
USD ($)
Nov. 13, 2023
USD ($)
Mar. 31, 2021
USD ($)
Mar. 17, 2021
USD ($)
CONVERTIBLE NOTES                        
Conversion of convertible notes into ordinary shares, Principal   ¥ (52,418,000) ¥ (98,428,000)                  
Conversion of convertible notes into ordinary shares, Accrued Interest   (1,046,000) (14,494,000)                  
Exchange rate change on convertible notes' face value   (289,000)                    
Amortization of debt discount premium (Interest Expenses) $ 2,300,000 16,300,000 31,800,000 ¥ 31,200,000                
March Note                        
CONVERTIBLE NOTES                        
Principal amount | $             $ 20,000,000       $ 20,000,000 $ 20,000,000
November Note                        
CONVERTIBLE NOTES                        
Principal amount | $                 $ 6,000,000      
February Note                        
CONVERTIBLE NOTES                        
Principal amount | $           $ 3,300,000            
September Note                        
CONVERTIBLE NOTES                        
Principal amount | $         $ 8,800,000              
Convertible Notes Payable, Net                        
CONVERTIBLE NOTES                        
Principal amount   48,152,000           ¥ 43,061,000   $ 6,000,000    
Accrued Interest   3,118,000           1,480,000        
Modified the CB principal     2,989,000                  
Repayment of convertible notes, Principal amount               (38,170,000)        
Repayment of convertible notes, Accrued interest               (3,590,000)        
Exchange rate change on convertible notes' face value   (289,000) ¥ 3,653,000                  
Convertible Notes Payable, Net | March Note                        
CONVERTIBLE NOTES                        
Principal amount               129,956,000        
Accrued Interest               18,084,000        
Convertible Notes Payable, Net | November Note                        
CONVERTIBLE NOTES                        
Principal amount   43,061,000           43,061,000        
Accrued Interest   2,044,000           1,480,000        
Convertible Notes Payable, Net | February Note                        
CONVERTIBLE NOTES                        
Principal amount   23,674,000                    
Accrued Interest   1,091,000                    
Convertible Notes Payable, Net | September Note                        
CONVERTIBLE NOTES                        
Principal amount   62,573,000                    
Accrued Interest   1,029,000                    
Convertible Notes Payable, Net | Total                        
CONVERTIBLE NOTES                        
Principal amount   76,601,000           43,061,000        
Accrued Interest   3,118,000           ¥ 1,480,000        
Convertible Notes Payable, Net | Less: Debt Discount                        
CONVERTIBLE NOTES                        
Less: Debt Discount   ¥ (28,449)