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Risks and Concentration (Details) ¥ in Thousands, $ in Thousands	Jun. 30, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Jun. 30, 2020	Dec. 31, 2019 CNY (¥)
Risks and Concentration (Details) [Line Items]
Cash and cash equivalents	¥ 175,391		$ 123,385
Short term borrowings	¥ 1,000	¥ 1,000			¥ 28,788
Two Suppliers [Member]
Risks and Concentration (Details) [Line Items]
Total cost of revenue, percentage	10.00%
One Customers [Member]
Risks and Concentration (Details) [Line Items]
Total cost of revenue, percentage				10.00%
Three Customers [Member]
Risks and Concentration (Details) [Line Items]
Total cost of revenue, percentage	10.00%

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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

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