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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Adoption of ASU) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Jan. 01, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
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Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities | $ 23,764 | ¥ 165,438 | ¥ 165,646 |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit | $ (256,474) | ¥ (1,785,517) | ¥ (1,232,991) |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  | ¥ (5,632)
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | ¥ 5,632
Previously Reported [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  | ¥ 73,577 |
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit |  |  |  |  | ¥ (879,393) |
Restatement Adjustment [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  | ¥ 67,945 |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit |  |  |  | ¥ (873,761) |  |

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