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Prepayments and other current assets - Schedule of Prepayment and Other Current Assets (Parenthetical) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Impairment charges ¥ 528 $ 83 ¥ 4,500 ¥ 0