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FINANCIAL STATEMENTS SCHEDULE I - FINANCIAL INFORMATION OF PARENT COMPANY - CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - Parenthetical (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Other comprehensive loss, tax ¥ 0 ¥ 0 ¥ 0
Parent | Reportable legal entity      
CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Other comprehensive loss, tax 0 0 0
Foreign currency translation adjustment, tax ¥ 0 ¥ 0 ¥ 0