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Income Taxes - Summary of composition of income tax expense (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Current and deferred components of income tax expense        
Current income tax ¥ 1,665   ¥ 2,697 ¥ 1,150
Deferred income tax 8,042   (2,142) 21,826
Income tax expense 9,707 $ 1,330 ¥ 555 ¥ 22,976
Profit before tax - Chinese mainland operations 294,733      
Profit before tax - Non-Chinese mainland operations 65,857      
Income tax expense - Chinese mainland operations 8,051      
Income tax expense - Non-Chinese mainland operations ¥ 1,656