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Income Taxes - Summary of current and deferred components of income tax expense (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 Taxes        
Current income tax ¥ 2,697   ¥ 1,150 ¥ 3,974
Deferred income tax (2,142)   21,826 (224,961)
Income tax (benefit)/expense ¥ 555 $ 78 ¥ 22,976 ¥ (220,987)