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ORGANIZATION AND PRINCIPAL ACTIVITIES - Cash and Cash Equivalent of VIE's (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | ---
Financial information of VIEs and subsidiaries/schools |  |  |  |
Cash and cash equivalents | $ 18,210 | ¥ 118,821 | ¥ 157,600 | ¥ 211,436
China |  |  |  |
Financial information of VIEs and subsidiaries/schools |  |  |  |
Cash and cash equivalents |  | 64,251 | 138,419 |
Variable interest entities and subsidiaries of VIEs | China |  |  |  |
Financial information of VIEs and subsidiaries/schools |  |  |  |
Cash and cash equivalents |  | 60,044 | 86,304 |
Non-VIE | China |  |  |  |
Financial information of VIEs and subsidiaries/schools |  |  |  |
Cash and cash equivalents |  | ¥ 4,207 | ¥ 52,115 |

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