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Fair Value Measurements - Schedule of reconciliation of derivative liability (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Fair Value Disclosures [Abstract]        
Balance at beginning of the year ¥ 100,279   ¥ 202,698 ¥ 170,508
The change in fair value (34,378) $ (4,710) (102,419) 32,190
Exercise of conversion features of convertible redeemable preferred shares upon the consummation of IPO (65,901)   0 0
Balance at end of the year ¥ 0   ¥ 100,279 ¥ 202,698