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Commitment and contingencies (Details)
¥ in Millions
1 Months Ended 12 Months Ended
May 05, 2023
USD ($)
May 05, 2023
CNY (¥)
Nov. 30, 2020
USD ($)
Nov. 30, 2020
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2024
CNY (¥)
Jan. 31, 2024
USD ($)
Jan. 31, 2024
CNY (¥)
Jun. 13, 2022
USD ($)
Jun. 13, 2022
CNY (¥)
Commitment [Line Items]                                  
Total consideration $ 20,700,000 ¥ 151.4 $ 17,100,000 ¥ 125.0                          
Deposit                     $ 2,100,000 ¥ 15.0          
Annual interest 7.00% 7.00%     7.00% 7.00%                      
Interest expense                     1,100,000 7.8          
Facilities and infrastructure consideration                               $ 11,700,000 ¥ 85.2
Remaining balance payable         $ 3,700,000               ¥ 27.2 $ 0.3 ¥ 2.0    
Total paid         17,000,000 ¥ 124.2                      
Real estate and land use rights transferred         11,700,000 ¥ 85.2                      
Remaining assets, valued         $ 9,100,000               ¥ 66.2        
Immaterial Asset Acquisitions [Member]                                  
Commitment [Line Items]                                  
Acquisition price             $ 1,500,000 ¥ 11.0 $ 6,400,000 ¥ 47.0 $ 7,100,000 ¥ 52.0