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Acquisition - Purchase price allocation (Details) ¥ in Thousands, $ in Thousands	Jan. 13, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)
Purchase price allocation
Goodwill		$ 17,688	¥ 115,414
Longye
Purchase price allocation
Goodwill	¥ 115,414
Net liabilities acquired, excluding intangible assets and the related deferred tax liabilities	(18,021)
Deferred tax liabilities	(6,483)
Purchase price allocation	¥ 116,865
Customer relationships
Purchase price allocation
Amortization period	3 years
Customer relationships | Longye
Purchase price allocation
Intangible assets	¥ 3,300
Trade names
Purchase price allocation
Amortization period	10 years
Trade names | Longye
Purchase price allocation
Intangible assets	¥ 4,822
Technologies
Purchase price allocation
Amortization period	7 years
Technologies | Longye
Purchase price allocation
Intangible assets	¥ 17,833

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- Definition

Amount of net liabilities acquired, excluding intangible assets and the related deferred tax liabilities.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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