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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS (Schedule of Information of Consolidating Statement of Cash Flows) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Statements of Cash Flows [Line Items] |  |  |  |
Cash flows from operating activities | ¥ 25,445 | $ 3,699 | ¥ 20,210 | ¥ 17,535
Cash flows from investing activities | (28,520) | (4,148) | (61,078) | (65,218)
Cash flows from financing activities | 46,872 | 6,817 | 39,205 | (1,504)
Cash and cash equivalents at beginning of year | 195,303 |  | 196,900 |
Cash and cash equivalents at end of year | 211,436 | 30,752 | 195,303 | 196,900
Parent Company [Member] |  |  |  |
Statements of Cash Flows [Line Items] |  |  |  |
Cash flows from operating activities | (86) | (13) | (18,255) | (6,348)
Cash flows from investing activities | (2,619) | (381) | (1,556) | 0
Cash flows from financing activities | 7,476 | 1,087 | 18,667 | (843)
Effects of exchange rate changes on cash and cash equivalents | 0 | 0 | 0 | 0
Net change in cash and cash equivalents | 4,771 | 693 | (1,144) | (7,191)
Cash and cash equivalents at beginning of year | 323 | 47 | 1,467 | 8,658
Cash and cash equivalents at end of year | ¥ 5,094 | $ 740 | ¥ 323 | ¥ 1,467

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