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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, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Income Tax Disclosure [Abstract]        
Current income tax (expense) benefit ¥ 3,529   ¥ (29,065) ¥ (6,861)
Deferred income tax expense 114   0 0
Total income tax (expense) benefit ¥ 3,643 $ 513 ¥ (29,065) ¥ (6,861)