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Fair Value Measurement - Fair Value Measurements of Company's Long-Term Financial Instruments (Details) - Fixed Income Products - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term investment - held-to-maturity, Carrying Value | ¥ 36,816 | ¥ 121,671
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term investment - held-to-maturity, Fair Value | 41,062 | 144,086
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term investment - held-to-maturity, Fair Value | ¥ 41,062 | ¥ 144,086

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