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Loans from a Third Party (Details)
¥ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Jun. 30, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Loans from a Third Party [Line Items]                  
Outstanding balances         $ 21.7 ¥ 157.4      
Interest expense $ 0.9                
Repaid instalment plan     $ 7.9 ¥ 56.0          
Tianjin Yizhong Jinshajiang Equity Investment Fund Partnership [Member]                  
Loans from a Third Party [Line Items]                  
Loans $ 18.0 $ 18.0         ¥ 115.0 ¥ 115.0  
Interest rate per annum 8.00% 8.00%         8.00% 8.00%  
Term of agreements 1 year 1 year              
Other income (expense)         0.7 4.4      
Accrued interests         $ 6.1 ¥ 41.4      
Tianqi Group [Member]                  
Loans from a Third Party [Line Items]                  
Repaid amount     7.9 ¥ 56.0          
Yizhong [Member]                  
Loans from a Third Party [Line Items]                  
Outstanding balances $ 14.6 $ 13.4              
Debt obligation     8.5           ¥ 60.0
Interest expense   $ 1.7 $ 3.6