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Income taxes - Income tax expense recognized in the consolidated statements of comprehensive loss (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Income taxes        
Current income tax expense ¥ 21,571 $ 3,128 ¥ 3,447 ¥ 228