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Accounts Receivable, Net - Balance of notes receivable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable Net [Abstract]    
Notes receivable, gross ¥ 37,520 ¥ 113,808
Allowance for credit losses (19,294) (4,994)
Notes receivable, net ¥ 18,226 ¥ 108,814