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Leases - Summary of maturities of lease liabilities (Detail) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Lessee Operating Lease Liability Maturity [Abstract]    
2020 ¥ 45,174  
2021 40,688  
2022 15,285  
2023 640  
Total undiscounted lease payments 101,787  
Less: imputed interest (16,644)  
Total lease liabilities ¥ 85,143 ¥ 118,420