v3.26.1
Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2025
Fair Value Measurement [Abstract]  
​Schedule of Warrant Liability at Fair Value

The following table presents the fair value hierarchy for the Group’s liabilities that are measured and recorded at fair value as of December 31, 2024 and 2025:

 

    For the year ended December 31,  
    2024     2025  
    Level 1
Inputs
    Level 2
Inputs
    Level 3
Inputs
    Level 1
Inputs
    Level 2
Inputs
    Level 3
Inputs
    Balance at fair value  
    RMB     RMB     RMB     RMB     RMB     RMB     US$  
Warrant liability     —       —       68,556       —       —       24,377       3,486  
                                                         
​Schedule of Black Scholes Model for the Valuation of the Fair Value of Warrants The valuation involves complex and subjective judgements as well as the Company’s best estimates on the valuation date. Key inputs related to the Black Scholes model for the valuation of the fair value of warrants are as follows:
   Issuance date
November 23,
2022
   As of
December 31,
2023
   As of
December 31,
2024
   As of
December 31,
2025
 
Expiration of warrant (years)   5    3.9    2.9    1.9 
Stock price per ADS (US$)   1.17    0.20    1.13    0.35 
Exercise price per ADS (US$)   2.75    2.75    1.45    0.75 
Risk-free rate   3.96%   3.92%   4.27%   3.73%
Dividend yield   
—
    
—
    
—
    
—
 
Standard derivation in the value of stock   132.3%   132.8%   140.7%   135.7%
Calculated fair value per ADS (US$)   0.95    0.10    0.85    0.18 
   Issuance date
October 28,
2024
   As of
December 31,
2024
   As of
December 31,
2025
 
Expiration of warrant (years)   5    4.8    3.8 
Stock price per ADS (US$)   1.48    1.13    0.35 
Exercise price per ADS (US$)   1.45    1.45    0.75 
Risk-free rate   4.11%   4.37%   3.73%
Dividend yield   
—
    
—
    
—
 
Standard derivation in the value of stock   125.4%   127.8%   135.7%
Calculated fair value per ADS (US$)   1.27    0.95    0.26 
​Schedule of Warrants Outstanding and Fair Values

The warrants outstanding and fair values at each of the respective valuation dates of the warrants issued on November 23, 2022 are summarized below:

 

    Warrants
Outstanding
Issued on
November 23,
2022
    Calculated Fair
Value per ADS
    Fair
Value
 
          US$     RMB  
Fair Value as of November 23, 2022     5,454,546       0.95       36,838  
Gain on change in fair value of warrant liability     —       —       (11,219 )
Effect of exchange rate changes     —       —       (1,243 )
Fair Value as of December 31, 2022     5,454,546       0.64       24,376  
Gain on change in fair value of warrant liability     —       —       (20,732 )
Effect of exchange rate changes     —       —       308  
Fair Value as of December 31, 2023     5,454,546       0.10       3,952  
Modification of warrants     4,894,565       —       —  
Loss on change in fair value of warrant liability     —       —       58,818  
Effect of exchange rate changes     —       —       610  
Fair Value as of December 31, 2024     10,349,111       0.85       63,380  
Modification of warrants     9,608,103       —       —  
Loss on change in fair value of warrant liability     —       —        (25,630 ) 
Exercised     (2,946,220 )     —        (15,080 )
Effect of exchange rate changes     —       —        (998 ) 
Fair Value as of December 31, 2025     17,010,994       0.18        21,672  

 

The warrants outstanding and fair values at each of the respective valuation dates of the warrants issued on October 28, 2024 are summarized below:

 

   Warrants
Outstanding
Issued on
October 28,
2024
   Calculated Fair
Value per ADS
   Fair
Value
 
       US$   RMB 
Fair Value as of October 28, 2024   761,719    1.27    6,888 
Gain on change in fair value of warrant liability   
—
    
—
    (1,752)
Effect of exchange rate changes   
—
    
—
    40 
Fair Value as of December 31, 2024   761,719    0.95    5,176 
Modification of warrants   707,179    
—
    
—
 
Gain on change in fair value of warrant liability   
—
    
—
    (2,394)
Effect of exchange rate changes   
—
    
—
    (77)
Fair Value as of December 31, 2024   1,468,898    0.26    2,705 
Schedule of Summarizes the Activities Related to Fair Value of the Warrants

The following table summarizes the activities related to fair value of the warrants issued on November 23, 2022 and October 28, 2024:

 

   For the Year Ended
December 31,
 
   2024   2025 
   RMB   RMB 
Fair value of warrants at beginning of the year (Level 3)   3,952    68,556 
Issuances   6,888    
—
 
Exercised   
—
    (15,080)
Change in fair value   57,066    (28,024)
Effect of exchange rate changes   650    (1,075)
Fair value of warrants at end of the year (Level 3)   68,556    24,377