Accounts receivable, net - Schedule of Accounts Receivable (Details) ¥ in Thousands, $ in Thousands |
Jun. 30, 2022
CNY (¥)
|
Jun. 30, 2022
USD ($)
|
Dec. 31, 2021
CNY (¥)
|
|---|---|---|---|
| Receivables [Abstract] | |||
| Accounts and notes receivable | ¥ 61,728 | $ 9,216 | ¥ 81,550 |
| Less: allowance for doubtful accounts | (26,590) | (3,970) | (37,690) |
| Total accounts and notes receivable, net | ¥ 35,138 | $ 5,246 | ¥ 43,860 |