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Accounts receivable, net - Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands | Jun. 30, 2024 USD ($) | Jun. 30, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Nonrelated Party |  |  |
Related party balances and transactions |  |  |
Accounts receivable |  | ¥ 243,589 | ¥ 288,507
Less: Allowance for doubtful accounts |  | (3,546) | (2,688)
Accounts receivable | $ 33,031 | 240,043 | 285,819
Related Party |  |  |
Related party balances and transactions |  |  |
Accounts receivable |  | 957,248 | 1,583,920
Less: Allowance for doubtful accounts |  | (23,275) | (11,217)
Accounts receivable | $ 128,519 | ¥ 933,973 | ¥ 1,572,703

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