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ACQUISITIONS AND DISPOSALS (Schedule of Pro forma Results) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
Tianjin Jiatai, SH Rongchi, Oriental, Heze MZJH, Wuxi MZJH And SH MZJH [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net revenues |  | ¥ 193,251 | $ 27,759 | ¥ 186,086
Net loss |  | (589,774) | $ (84,716) | ¥ (376,130)
Guofu Huimei, Beijing Century Friendship, BPMC And CMCC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net revenues | ¥ 12,056 | 4,569 |  |
Net loss | ¥ (63,159) | ¥ (70,018) |  |

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