Prepaid Expense and Other Assets - Allowance for doubtful accounts (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Balance at beginning of the year	¥ (12,635)
Additions	(965)	¥ (12,635)
Reversals	42
Write-off	184
Balance at end of the year	(14,979)	(12,635)
Impact of adoption of ASC 326
Balance at beginning of the year	¥ 1,605
Balance at end of the year		¥ 1,605

The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

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