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Leases - Summary of maturities of lease liabilities (Detail) - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Jan. 01, 2019
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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

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