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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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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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