v3.26.3
Related Parties - Additional Information (Detail) - ATR [Member]
¥ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2026
CNY (¥)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
CNY (¥)
Sep. 30, 2026
USD ($)
Sep. 30, 2026
CNY (¥)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
CNY (¥)
Related Party Transaction [Line Items]                
Land lease commenced year         2007 2007    
Land lease expiry year         2054 2054    
Rent paid $ 33 ¥ 223 $ 33 ¥ 223 $ 100 ¥ 669 $ 100 ¥ 669
Akers AB [Member]                
Related Party Transaction [Line Items]                
Ownership interest percentage 59.88% 59.88%     59.88% 59.88%