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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 |  |  |  |

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