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Trade Receivables - Schedule of Trade Receivables (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade receivables      
Total trade receivables ¥ 111,104 ¥ 181,722  
Trade receivables [member]      
Trade receivables      
Receivables from third‑party customers 116,776 192,540  
Allowance for ECLs (5,672) (10,818) ¥ (3,346)
Total trade receivables ¥ 111,104 ¥ 181,722