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Significant Accounting Policies - Leases (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Significant Accounting Policies |  |  |  |  |
Total right-of use assets |  |  |  |  | ¥ 235,700
Lease expire |  | Dec. 31, 2025 |  |  |
Weighted average term |  | 3 years 1 month 6 days | 3 years 2 months 12 days |  |
Discount rate |  | 4.75% | 4.75% |  |
Operating lease rent expense |  |  |  | ¥ 55,800 |
Operating Lease, Cost |  | ¥ 107,200 | ¥ 79,400 |  |
Operating Leases [Abstract] |  |  |  |  |
2021 |  | 156,869 |  |  |
2022 |  | 171,923 |  |  |
2023 |  | 106,253 |  |  |
2024 |  | 43,575 |  |  |
2025 and thereafter |  | 17,813 |  |  |
Total future lease payments |  | 496,433 |  |  |
Impact of discounting remaining lease payments |  | (42,642) |  |  |
Total lease liabilities |  | ¥ 453,791 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  | us-gaap:OperatingLeaseLiability |  |  |
Under Leases [Abstract] |  |  |  |  |
2019 | [1] |  |  | 65,400 |
2020 | [1] |  |  | 72,230 |
2021 | [1] |  |  | 73,054 |
2022 | [1] |  |  | 69,681 |
Beyond 2022 | [1] |  |  | ¥ 19,544 |
[1] | Amounts are based on ASC 840, Leases that were superseded upon the Company’s adoption of ASC 842, Leases on January 1, 2019.

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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