Prepayments and other current assets - Schedule of Prepayment and Other Current Assets (Parenthetical) (Details) ¥ in Thousands, $ in Thousands |
6 Months Ended | ||
|---|---|---|---|
|
Jun. 30, 2022
CNY (¥)
|
Jun. 30, 2022
USD ($)
|
Jun. 30, 2021
CNY (¥)
|
|
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] | |||
| Impairment charges | ¥ 666 | $ 99 | ¥ 0 |