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Revenue from contracts with customers - Schedule Of Revenue Recognized (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of performance obligations [abstract]      
Amounts include in contract liabilities at the beginning of the year ¥ 72,321 $ 10,207 ¥ 55,604