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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, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |  |
Net cash (used in) generated from operating activities | ¥ (216,694) | $ (31,419) | ¥ (359,313) | ¥ (229,766)
Net cash (used in) generated from investing activities | (118,792) | (17,223) | (565,981) | (533,885)
Net cash (used in) generated from financing activities | 383,088 | 55,542 | 642,449 | 1,138,302
Exchange rate effect on cash | (47,170) | (6,837) | (4,639) | (2,563)
Net (decrease) increase in cash | 432 | 63 | (287,484) | 372,088
Cash at beginning of the year | 157,386 |  |  |
Cash at end of the year | 158,283 | 22,949 | 157,386 |
Parent Company |  |  |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |  |
Net cash (used in) generated from operating activities | (2,047) | (297) | (9,301) | 9,041
Net cash (used in) generated from investing activities | (29,335) | (4,253) | (88,546) | (7,468)
Net cash (used in) generated from financing activities | 16,591 | 2,405 | 110,876 |
Exchange rate effect on cash | 1,243 | 181 | (50) | (34)
Net (decrease) increase in cash | (13,548) | (1,964) | 12,979 | 1,539
Cash at beginning of the year | 15,058 | 2,183 | 2,079 | 540
Cash at end of the year | ¥ 1,510 | $ 219 | ¥ 15,058 | ¥ 2,079

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