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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of assets acquired at the acquisition date.

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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of 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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ACQUISITION - Jinghan Taihe - Summary (Details) ¥ in Thousands, $ in Thousands	1 Months Ended
	Feb. 28, 2019 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Goodwill		$ 3,940	¥ 25,710	¥ 60,353	¥ 73,166
Ten Tutoring Centers controlled by Beijing Xinganxian
Business Acquisition [Line Items]
Property and equipment	¥ 1,023
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Goodwill	20,911
Defer tax assets, net of deferred tax liabilities	6,987
Total assets	33,113
Deferred revenue	(27,871)
Other payables	(14,342)
Total liabilities	¥ (9,100)
Trademark
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Amortization Period (in years)	3 years
Trademark \| Ten Tutoring Centers controlled by Beijing Xinganxian
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Finite lived intangible assets	¥ 2,322
Workforce
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Amortization Period (in years)	2 years
Workforce \| Ten Tutoring Centers controlled by Beijing Xinganxian
Business Acquisition Purchase Price Allocation Intangible Assets [Abstract]
Finite lived intangible assets	¥ 1,870