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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, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in ) generated from operating activities | ¥ (359,313) | $ (56,387) | ¥ (229,766) | ¥ (195,347)
Net cash generated (used in) from investing activities | (565,981) | (88,815) | (533,885) | (1,071,507)
Net cash used in financing activities | 642,449 | 100,813 | 1,138,302 | 513,268
Cash at beginning of the year | 334,264 |  |  |
Cash at end of the year | 157,386 | 24,697 | 334,264 |
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in ) generated from operating activities | (9,301) | (1,460) | 9,041 | (31,460)
Net cash generated (used in) from investing activities | (88,546) | (13,895) | (7,468) | 311,716
Net cash used in financing activities | 110,876 | 17,399 |  | (280,483)
Exchange rate effect on cash | (50) | (7) | (34) | 45
Net (decrease) increase in cash | 12,979 | 2,037 | 1,539 | (182)
Cash at beginning of the year | 2,079 | 326 | 540 | 722
Cash at end of the year | ¥ 15,058 | $ 2,363 | ¥ 2,079 | ¥ 540

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