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Fair Value Measurement - Fair value of the guarantee derivatives (Details) - Level 3
¥ in Thousands
12 Months Ended
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