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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Condensed statements of cash flows) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash used in operating activities | $ (28,058) | ¥ (195,347) | ¥ (38,591) | ¥ 26,732
Net cash generated from (used in) investing activities | (153,913) | (1,071,507) | (1,000,355) | (313,010)
Net cash generated from(used in) financing activities | 73,726 | 513,268 | 1,203,042 | 189,899
Cash at beginning of the year |  | 404,742 |  |
Cash at end of the year | 10,674 | 74,307 | 404,742 |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash used in operating activities | (4,520) | (31,460) | (5,024) | (89,751)
Net cash generated from (used in) investing activities | 44,775 | 311,716 | 294,551 | (21,452)
Net cash generated from(used in) financing activities | (40,289) | (280,483) | (284,824) | 127,106
Exchange rate effect on cash | 7 | 45 | (7,085) | (35,017)
Net decrease in cash | (27) | (182) | (2,382) | (19,114)
Cash at beginning of the year | 105 | 722 | 3,104 | 22,218
Cash at end of the year | $ 78 | ¥ 540 | ¥ 722 | ¥ 3,104

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