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Prepayments and other current assets - Schedule of prepayments and other current assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Prepaid Expense and Other Assets, Current [Abstract]
Prepayments to suppliers	¥ 167,747		¥ 302,421
Receivables from partial sale of equity interest in SiEngine (refer to Note 9)	130,000		0
Contract cost assets	69,932		104,309
Others	84,606		36,770
Prepayments and other current assets	¥ 452,285	$ 61,959	¥ 443,500

X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

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- Definition

The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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