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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - Cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities ¥ 172,122 $ 24,242 ¥ 188,466 ¥ 38,214
Net cash provided by (used in) investing activities (6,509) (917) (32,842) (31,951)
Net cash provided by (used in) financing activities (9,448) (1,331) (6,956) 410
Effect of exchange rate changes on cash and cash equivalents 7,603 1,073 45,969 (12,993)
Net change in cash and cash equivalents 163,768 23,067 194,637 (6,320)
Cash and cash equivalents at the beginning of the year 1,049,999 147,889 855,362 861,682
Cash and cash equivalents at the end of the year 1,213,767 170,956 1,049,999 855,362
Parent Company        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities (15,968) (2,249) (18,992) (15,837)
Net cash provided by (used in) investing activities (25,483) (3,589) (1,655) 127,514
Net cash provided by (used in) financing activities (9,448) (1,331) (6,956) 313
Effect of exchange rate changes on cash and cash equivalents 2,648 373 17,047 (3,787)
Net change in cash and cash equivalents (48,251) (6,796) (10,556) 108,203
Cash and cash equivalents at the beginning of the year 186,825 26,314 197,381 89,178
Cash and cash equivalents at the end of the year ¥ 138,574 $ 19,518 ¥ 186,825 ¥ 197,381