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Accounts and notes receivable, net - Schedule of Accounts Receivable (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Receivables [Abstract]      
Accounts and notes receivable ¥ 77,560 $ 12,012 ¥ 88,706
Less: allowance for doubtful accounts (39,420) (6,105) (43,820)
Total accounts and notes receivable, net ¥ 38,140 $ 5,907 ¥ 44,886