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Consolidated Balance Sheets (Parenthetical)
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2023
$ / shares
Accounts receivable, net | ¥ ¥ 1,758   ¥ 2,201  
Prepaid expenses and other current assets, net | ¥ 0   373  
Accounts payable, current related parties current | ¥ 6,188   17,855  
Short term borrowings to related party | ¥ 163,000   46,800  
Deferred revenue, current related party | ¥ 125,428   188,485  
Acquisition consideration payable, related party | ¥ 5,792   5,792  
Other payable and accrued liabilities, related party | ¥ 17,451   40,025  
Derivative Liabilities Current Related Party | ¥ 0   0  
Operating lease liabilities, current related party | ¥ 8,920   12,778  
Long term borrowings non-current related party | ¥ 125,500   219,000  
Operating lease liabilities, non-current related party | ¥ 17,439   20,257  
Deferred revenue, non-current related party | ¥ ¥ 57,710   ¥ 58,952  
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001
Ordinary shares, authorized 0 0 390,518,031  
Ordinary shares, issued 0 0 48,253,425  
Ordinary shares, outstanding 0 0 48,253,425  
Other Liabilities ¥ 2,452 $ 336    
Related Party [Member] | Nonrecourse [Member] | Consolidated Entity Variable Interest Entities VIE [Member]        
Other Liabilities | ¥ ¥ 2,452   ¥ 0  
Series A convertible redeemable preferred shares [Member]        
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Preferred stock, shares authorized 15,040,570 15,040,570 15,040,570  
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0  
Series B convertible redeemable preferred shares [Member]        
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Preferred stock, shares authorized 7,085,330 7,085,330 7,085,330  
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0  
Series C convertible redeemable preferred shares [Member]        
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Preferred stock, shares authorized 23,786,590 23,786,590 23,786,590  
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0  
Series D convertible redeemable preferred shares [Member]        
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Preferred stock, shares authorized 37,152,161 37,152,161 37,152,161  
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0  
Series E convertible redeemable preferred shares [Member]        
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Preferred stock, shares authorized 26,417,318 26,417,318 26,417,318  
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0  
Class A ordinary shares [Member]        
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.0001   0.0001
Ordinary shares, authorized 483,068,176 483,068,176 0  
Ordinary shares, issued 163,294,773 163,294,773 0  
Ordinary shares, outstanding 163,294,773 163,294,773 0  
Class B ordinary shares [Member]        
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001
Ordinary shares, authorized 16,931,824 16,931,824 0  
Ordinary shares, issued 16,931,824 16,931,824 0  
Ordinary shares, outstanding 16,931,824 16,931,824 0