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ACCOUNTS RECEIVABLE, NET - Allowance (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Allowance for expected credit losses:      
Balance at beginning of the year ¥ (4,944) ¥ (2,535) ¥ (835)
Additions (695) (3,552) (1,711)
Write-offs 1,161 1,143 11
Balance at end of the year ¥ (4,478) ¥ (4,944) ¥ (2,535)