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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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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