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Fair Value Measurement - Fair value of the guarantee derivatives (Details) - Level 3 ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Issuances | ¥ 143
Net cash payout | 11
Change in fair value | 233
Fair value of guarantee liabilities at end of the year | ¥ 387

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