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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Number of new stock issued during the period.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Transaction with JD.com, Inc. - Additional Information (Details) ¥ in Thousands, $ in Thousands			12 Months Ended
	May 08, 2015 CNY (¥) shares	May 08, 2015 USD ($) shares	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2020 USD ($)
Transaction with JD.com, Inc. [Line Items]
Impairment of intangible assets			¥ 31,876	$ 4,885	¥ 32,014
Carrying value of above intangible assets			71,362		166,267	$ 10,937
Business Cooperation Agreement [Member]
Transaction with JD.com, Inc. [Line Items]
Agreement period	5 years	5 years
Impairment of intangible assets			9,554		¥ 32,014
Carrying value of above intangible assets			¥ 0
Share subscription agreement and Business Cooperation Agreement [Member] \| Class A ordinary shares
Transaction with JD.com, Inc. [Line Items]
Ordinary shares issued \| shares	65,625,000	65,625,000
Cash consideration of ordinary shares issued	¥ 1,528,200	$ 250,000