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GOING CONCERN (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Going Concern [Line Items] |  |  |  |  |  |
Unrestricted cash and cash equivalents |  | ¥ 211,436 |  | $ 30,752 | ¥ 195,303 | ¥ 196,900
Amount by which consolidated current liabilities exceeded consolidated current assets |  | 89,747 |  |  |  |
Consolidated net assets |  | 262,771 |  |  |  |
Total lease commitment amount |  | 170,633 |  |  |  |
Lease commitment within one year |  | 35,325 |  |  |  |
Short term investments, available for sale |  | 47,208 |  | 6,866 | 128,042 |
Short term investments, held to maturity |  | 70,000 |  | $ 10,181 | ¥ 93,000 |
American Depository Shares [Member] |  |  |  |  |  |
Going Concern [Line Items] |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  | ¥ 45,402 | $ 7,113 |  |  |
Stock Issued During Period, Shares, New Issues | shares | 2,070,000 | 2,070,000 | 2,070,000 |  |  |
Share Price | $ / shares |  |  |  | $ 4.25 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Going Concern [Line Items] |  |  |  |  |  |
Unrestricted cash and cash equivalents |  | ¥ 196,339 |  |  |  |

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