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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, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Income Tax Disclosure [Abstract]        
Current income tax (expense) benefit ¥ (19,721)   ¥ 3,529 ¥ (29,065)
Deferred income tax benefit 18,239 $ 2,499 114 0
Total income tax (expense) benefit ¥ (1,482) $ (203) ¥ 3,643 ¥ (29,065)