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Net Revenues - Accounts receivable and contract balances (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)
Accounts receivable
Opening Balance	¥ 485,044		¥ 85,821	¥ 56,319
Increase(decrease), net	39,774		399,223	29,502
Ending Balance	524,818	$ 73,919	485,044	85,821
Contract assets
Opening Balance	12,600		146,537	38,337
Increase(decrease), net	7,088		(133,937)	108,200
Ending Balance	19,688	2,773	12,600	146,537
Contract liabilities
Opening Balance	40,378		122,603	9,357
Increase(decrease), net	39,547		(82,225)	113,246
Ending Balance	79,925	$ 11,257	40,378	122,603
Contract liabilities, revenue recognized	¥ 37,111		¥ 109,120	¥ 8,048

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- Definition

Amount of increase (decrease) in accounts receivables.

+ References

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Amount of increase (decrease) in contract assets.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Name Accounting Standards Codification
-Section 45
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- References

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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