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INVESTMENTS IN CONSOLIDATED SUBSIDIARIES - Shenzhen Shuzhi (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Sep. 23, 2025
shares
Jul. 22, 2025
CNY (¥)
shares
Jul. 21, 2025
CNY (¥)
shares
Mar. 26, 2025
CNY (¥)
shares
Nov. 13, 2023
shares
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 18, 2024
item
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Carrying value of noncontrolling interest           ¥ (21,043) $ (3,009) ¥ (13,777) $ (1,971)   ¥ (24,936) $ (3,567) ¥ (17,771) $ (2,541)
Issuance of ordinary shares           69,704                
Shenzhen Shuzhi Technology Co Ltd                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Grant date fair value of shares issued     ¥ 9,800                      
Amount recognized     0     0                
Share based compensation expense     ¥ 3,500                      
Number of shares released | shares     9,946,200                      
Percentage of grant date fair value     35.38%                      
Number of shares canceled | shares     18,163,800                      
Fair value of share canceled     ¥ 6,300                      
Payment to noncontrolling interest   ¥ 14,560                        
Excess over carrying value of noncontrolling interest   15,000                        
Threshold net profit after tax   ¥ 20,000                        
Maximum period for achievement of milestone   5 years                        
Goodwill   ¥ 0                        
Shenzhen Shuzhi Technology Co Ltd | First operational year                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Number of shares released | shares   0                        
Share value of contingent consideration   ¥ 15,000                        
Cash installment of contingent consideration   15,000                        
Threshold net profit after tax   ¥ 20,000                        
Shenzhen Shuzhi Technology Co Ltd | Second operational year                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Number of shares released | shares   0                        
Share value of contingent consideration   ¥ 15,000                        
Cash installment of contingent consideration   15,000                        
Threshold net profit after tax   ¥ 20,000                        
Class A ordinary shares                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Issuance of ordinary shares (in shares) | shares 65,934,000       150,000,000                  
Class A ordinary shares | Shenzhen Shuzhi Technology Co Ltd                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Number of shares issued | shares       28,110,000                    
Grant date fair value of shares issued       ¥ 9,800                    
Contingent consideration       36,800                    
Amount recognized       ¥ 0                    
Issuance of ordinary shares (in shares) | shares   66,356,400                        
Issuance of ordinary shares           ¥ 15,000                
Shenzhen Shuzhi Technology Co Ltd                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Total number of board members | item                   3        
Shenzhen Shuzhi Technology Co Ltd                            
Schedule of Investments in Consolidated Subsidiaries [Line Items]                            
Percentage of interest owned                   51.00%        
Percentage of shares owned   49.00% 49.00%             49.00%        
Number of board members appointed by parent | item                   2        
Carrying value of noncontrolling interest   ¥ 440