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Trade Receivables - Schedule of Allowance for ECLs (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade Receivables [Line Items]      
Impairment losses, net ¥ 20,653 ¥ 35,240 ¥ 3,088
Trade receivables [member]      
Trade Receivables [Line Items]      
At the beginning of the year (10,818) (3,346)  
Impairment losses, net (18,653) (34,983)  
Amount written off as uncollectible 23,799 27,511  
At the end of the year ¥ (5,672) ¥ (10,818) ¥ (3,346)