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Short-term borrowings - Additional Information (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Short-term Debt [Line Items]      
Short-term bank borrowings ¥ 235,000   ¥ 25,000
Short term debt 235,000 $ 33,756 25,000
Collateral Pledged [Member]      
Short-term Debt [Line Items]      
Short term debt ¥ 251,853   ¥ 26,000
Weighted Average [Member]      
Short-term Debt [Line Items]      
Short term borrowings interest rate 4.27% 4.27% 3.63%