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Concentration and Risk (Details) ¥ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 HKD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Concentration and Risk
Cash and cash equivalents and restricted cash	¥ 182,745	$ 26,498		¥ 516,238	$ 74,847	¥ 936,030	¥ 1,333,872
PRC
Concentration and Risk
Cash, PRC insured	500,000
Hong Kong
Concentration and Risk
Cash, PRC insured | $			$ 500,000
RMB | PRC
Concentration and Risk
Cash and cash equivalents and restricted cash	114,589			264,964
U. S. Dollar | PRC
Concentration and Risk
Cash and cash equivalents and restricted cash	10,401			69,762
U. S. Dollar | Hong Kong
Concentration and Risk
Cash and cash equivalents and restricted cash	57,421			181,263
Hong Kong dollar | Hong Kong
Concentration and Risk
Cash and cash equivalents and restricted cash	¥ 334			¥ 249

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- Definition

The maximum amount of insurance on deposits in banks and financial institutions.

+ References

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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