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Revenue from contracts with customers - Performance Obligations (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 155,192 $ 21,847 ¥ 195,245
Within one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service 102,978 14,497 117,906
More than one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 52,214 $ 7,350 ¥ 77,339