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Fair Value Measurements - Summary of Assets And Liabilities Measured Or Disclosed At Fair Value (Details) ¥ in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Jun. 30, 2021 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	¥ 1,905	¥ 100	$ 295
Property and equipment, net	75,486	73,522	11,691
Fair value adjustment	1,905	(49,691)
Total assets and liabilities measured at fair value	1,905	4,605	295
Fair Value, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Property and equipment, net		4,505
Property and equipment, net, Fair value adjustment		(10,952)
Fair value adjustment		(38,739)
Fair Value, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	1,905	100	$ 295
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets and liabilities measured at fair value	1,905	4,605
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Property and equipment, net		4,505
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	¥ 1,905	¥ 100

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Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

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Fair value of asset after deduction of liability.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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