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Prepayments, Other Receivables and Other Assets - Schedule of Allowance for ECLs (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Prepayments Other Receivables And Other Assets [Line Items]      
Impairment losses, net ¥ (20,653) ¥ (35,240) ¥ (3,088)
Prepayments Other Receivables and Other Assets      
Prepayments Other Receivables And Other Assets [Line Items]      
At the beginning of the year 0 (806)  
Impairment losses, net 0 [1] (257)  
Amount written off as uncollectible 0 1,063  
At the end of the year ¥ 0 [1] ¥ 0 ¥ (806)
[1] Less than RMB 1,000