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Accounts receivable, net - Summary of movements in allowance for doubtful accounts (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2023 USD ($)
Beginning balance	¥ 10,261
Accounts Receivable Net of Allowance	19,263	¥ 10,261	$ 2,713
Additions	(18,468)	(10,866)
Reversals	9,908
Write-offs	33	605
Ending balance	19,263	¥ 10,261
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Receivable Net of Allowance	¥ (475)

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
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X

- Definition

Allowance for doubtful accounts receivable additions.

+ References

No definition available.

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