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ORGANIZATION AND PRINCIPAL ACTIVITIES (Schedule of the Group's Cash and Cash Equivalents by Currency Denomination and Jurisdiction) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | ---
VIE arrangements [Line Items] |  |  |  |
Cash and cash equivalents | ¥ 211,436 | $ 30,752 | ¥ 195,303 | ¥ 196,900
Non-VIEs [Member] | China [Member] |  |  |  |
VIE arrangements [Line Items] |  |  |  |
Cash and cash equivalents | 2,179 |  | 4,178 |
Group [Member] | China [Member] |  |  |  |
VIE arrangements [Line Items] |  |  |  |
Cash and cash equivalents | 189,994 |  | 173,356 |
Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
VIE arrangements [Line Items] |  |  |  |
Cash and cash equivalents | 196,339 |  |  |
Variable Interest Entity Primary Beneficiary [Member] | China [Member] |  |  |  |
VIE arrangements [Line Items] |  |  |  |
Cash and cash equivalents | ¥ 187,815 |  | ¥ 169,178 |

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