v3.26.3
Fair Value Measurement - ​Schedule of Warrants Outstanding and Fair Values (Details)
¥ in Thousands
1 Months Ended 2 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
$ / shares
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2024
$ / shares
Dec. 31, 2024
CNY (¥)
shares
Jun. 30, 2026
$ / shares
Jun. 30, 2026
CNY (¥)
shares
Dec. 31, 2025
$ / shares
Dec. 31, 2025
CNY (¥)
shares
Dec. 31, 2024
$ / shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
CNY (¥)
shares
November 23, 2022 [member]                        
​Schedule of Warrants Outstanding and Fair Values [Line Items]                        
Warrants outstanding, fair value beginning balance | shares   5,454,546       17,010,994   10,349,111   5,454,546   5,454,546
Calculated fair value per ADS, fair value beginning balance | $ / shares $ 0.95       $ 0.18   $ 0.85   $ 0.1   $ 0.64  
Fair value, beginning balance | ¥   ¥ 36,838       ¥ 21,672   ¥ 63,380   ¥ 3,952   ¥ 24,376
Warrants outstanding, Gain on change in fair value of warrant liability | shares              
Calculated fair value per ADS, Gain on change in fair value of warrant liability | $ / shares              
Fair value, Gain on change in fair value of warrant liability | ¥   ¥ (11,219)       ¥ (2,725)   ¥ (25,630)   ¥ 58,818   ¥ (20,732)
Warrants outstanding, modification of warrants | shares           25,753,782   9,608,103   4,894,565    
Calculated fair value per ADS, modification of warrants | $ / shares                  
Fair value, modification of warrants | ¥                  
Warrants outstanding, Exercised | shares           (1,350,000)   (2,946,220)        
Calculated fair value per ADS, Exercised | $ / shares                    
Fair value, Exercised | ¥           ¥ (3,429)   ¥ (15,080)        
Warrants outstanding, effect of exchange rate changes | shares              
Calculated fair value per ADS, effect of exchange rate changes | $ / shares              
Fair value, effect of exchange rate changes | ¥   ¥ (1,243)       ¥ (696)   ¥ (998)   ¥ 610   ¥ 308
Warrants outstanding, fair value ending balance | shares   5,454,546   10,349,111   41,414,776   17,010,994   10,349,111   5,454,546
Calculated fair value per ADS, fair value ending balance | $ / shares $ 0.64   $ 0.85   0.05   0.18   0.85   $ 0.1  
Fair value, ending balance | ¥   ¥ 24,376   ¥ 63,380   ¥ 14,822   ¥ 21,672   ¥ 63,380   ¥ 3,952
October 28, 2024 [Member]                        
​Schedule of Warrants Outstanding and Fair Values [Line Items]                        
Warrants outstanding, fair value beginning balance | shares       761,719   1,468,898   761,719        
Calculated fair value per ADS, fair value beginning balance | $ / shares     1.27   0.26   0.95          
Fair value, beginning balance | ¥       ¥ 6,888   ¥ 2,705   ¥ 5,176        
Warrants outstanding, Gain on change in fair value of warrant liability | shares                  
Calculated fair value per ADS, Gain on change in fair value of warrant liability | $ / shares                  
Fair value, Gain on change in fair value of warrant liability | ¥       ¥ (1,752)   ¥ (1,896)   ¥ (2,394)        
Warrants outstanding, modification of warrants | shares               707,179        
Calculated fair value per ADS, modification of warrants | $ / shares                      
Fair value, modification of warrants | ¥                      
Warrants outstanding, effect of exchange rate changes | shares                  
Calculated fair value per ADS, effect of exchange rate changes | $ / shares                  
Fair value, effect of exchange rate changes | ¥       ¥ 40   ¥ (73)   ¥ (77)        
Warrants outstanding, fair value ending balance | shares       761,719   1,468,898   1,468,898   761,719    
Calculated fair value per ADS, fair value ending balance | $ / shares     $ 0.95   $ 0.07   $ 0.26   $ 0.95      
Fair value, ending balance | ¥       ¥ 5,176   ¥ 736   ¥ 2,705   ¥ 5,176