Significant Accounting Policies - Goodwill (Details) - CNY (¥)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant Accounting Policies
Goodwill impairment charges	¥ 0	¥ 0	¥ 0

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration