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Accounts and notes receivable, net - Schedule of Accounts Receivable (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Receivables [Abstract]      
Accounts and notes receivable ¥ 81,550 $ 12,797 ¥ 88,706
Less: allowance for doubtful accounts (37,690) (5,914) (43,820)
Total accounts and notes receivable, net ¥ 43,860 $ 6,883 ¥ 44,886