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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, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |  |
Net cash (used in) generated from operating activities | ¥ (397,749) | $ (54,491) | ¥ (276,471) | ¥ (216,694)
Net cash (used in) generated from investing activities | (593,444) | (81,300) | (47,681) | (118,792)
Net cash (used in) generated from financing activities | 1,146,031 | 157,005 | 257,653 | 383,088
Exchange rate effect on cash | (8,275) | (1,134) | (2,425) | (47,170)
Net (decrease) increase in cash | 146,563 | 20,080 | (68,924) | 432
Cash at beginning of the year | 58,139 |  |  |
Cash at end of the year | 216,224 | 29,623 | 58,139 |
Parent Company |  |  |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |  |
Net cash (used in) generated from operating activities | 641 | 88 | (1,258) | (2,047)
Net cash (used in) generated from investing activities | 19,039 | 2,608 | 15,655 | (29,335)
Net cash (used in) generated from financing activities | (37,226) | (5,100) | 1,590 | 16,591
Exchange rate effect on cash | 489 | 67 | (31) | 1,243
Net (decrease) increase in cash | (17,057) | (2,337) | 15,956 | (13,548)
Cash at beginning of the year | 17,466 | 2,393 | 1,510 | 15,058
Cash at end of the year | ¥ 409 | $ 56 | ¥ 17,466 | ¥ 1,510

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