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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Segment
$ / shares
shares
Jun. 30, 2025
CNY (¥)
Segment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment
$ / shares
shares
Dec. 31, 2024
CNY (¥)
Segment
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
Summary of Significant Accounting Policies [Line Items]              
Underpayment of taxes $ 13,788 ¥ 100,000   $ 13,700 ¥ 100,000    
Accrued income tax payable | $ $ 9   $ 9        
Number of reportable segment | Segment 1 1   1 1    
Advertising expenses | $       $ 800   $ 5,700 $ 900
Employee benefits expenses | $       800   1,800 $ 900
Accrued income tax payable | $       $ 9   $ 9  
Representative Warrants [Member]              
Summary of Significant Accounting Policies [Line Items]              
Price per warrant | $ / shares $ 0.06     $ 0.06   $ 0.33  
Exercise price | $ / shares $ 12     $ 12      
Warrants issued | shares 690,000     690,000      
Private Warrants [Member]              
Summary of Significant Accounting Policies [Line Items]              
Price per warrant | $ / shares $ 0.11     $ 0.03   $ 0.17  
Exercise price | $ / shares $ 11.5     $ 11.5      
Warrants issued | shares 350,000     350,000      
Public Warrants [Member]              
Summary of Significant Accounting Policies [Line Items]              
Warrants issued | shares 13,800,000     13,800,000