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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Adoption of ASU) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | --- | ---
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities | [1] | ¥ 165,646 | $ 24,092 |  | ¥ 73,577 |
Equity [Abstract] |  |  |  |  |  |
Accumulated deficit |  | ¥ (1,232,991) | $ (179,331) |  | (879,393) |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  | ¥ (5,632)
Equity [Abstract] |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | ¥ 5,632
Previously Reported [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  | 73,577 |
Equity [Abstract] |  |  |  |  |  |
Accumulated deficit |  |  |  |  | ¥ (879,393) |
Restatement Adjustment [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Deferred tax liabilities |  |  |  | ¥ 67,945 |  |
Equity [Abstract] |  |  |  |  |  |
Accumulated deficit |  |  |  | ¥ (873,761) |  |
[1] | On the face of balance sheet, as at December 31, 2017 and 2018, deferred tax assets of approximately RMB9,566 and RMB696 (US$101) have been offset against deferred tax liabilities.

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