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Fair Value measurement - Summary of Fair Value Assets Measured on Recurring Basis (Detail) - Listed Equity Securities [Member] - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Investments accounted for at fair value    
Investments, Fair Value ¥ 808 ¥ 840
Fair Value, Inputs, Level 1 [Member]    
Investments accounted for at fair value    
Investments, Fair Value 808 840
Fair Value, Inputs, Level 2 [Member]    
Investments accounted for at fair value    
Investments, Fair Value 0 0
Fair Value, Inputs, Level 3 [Member]    
Investments accounted for at fair value    
Investments, Fair Value ¥ 0 ¥ 0