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Accounts receivable, net - Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Nonrelated Party      
Related party balances and transactions      
Accounts receivable ¥ 224,560   ¥ 288,507
Less: Allowance for doubtful accounts (3,454)   (2,688)
Accounts receivable 221,106 $ 30,291 285,819
Related Party      
Related party balances and transactions      
Accounts receivable 1,395,833   1,583,920
Less: Allowance for doubtful accounts (22,000)   (11,217)
Accounts receivable ¥ 1,373,833 $ 188,214 ¥ 1,572,703