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Accounts and notes receivable, net - Schedule of Movement in Allowance for Doubtful Accounts (Details)
¥ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Receivables [Abstract]      
Beginning balance ¥ 43,820 $ 6,787 ¥ 28,516
Provisions 221 34 18,732
Write-offs (4,621) (716) (3,428)
Ending balance ¥ 39,420 $ 6,105 ¥ 43,820