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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Condensed statements of cash flows) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Condensed Financial Statements, Captions [Line Items]        
Net cash used in operating activities ¥ (38,591) $ (5,614) ¥ 26,732 ¥ (78,078)
Net cash generated from (used in) investing activities (1,000,355) (145,496) (313,010) (74,847)
Net cash (used in) generated from financing activities 1,203,042 174,976 189,899 (117,922)
Exchange rate effect on cash 459 67 157 (11,240)
Net increase (decrease) in cash 164,555 23,933 (96,222) (282,087)
Cash at beginning of the year 98,191 451 22,218 1,768
Cash at end of the year ¥ 404,742 $ 58,867 ¥ 98,191 ¥ 22,218