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Prepayments and other current assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Schedule of Prepayment and Other Current Assets |
|  |  |  |  | As of December 31, |
|  |  |  |  | 2020 |  |  | 2021 |
|  |  |  |  | RMB |  |  | RMB |  |  | US$ |
Receivables on behalf of third party advertising companies | (i | ) |  |  |  |  | — |  |  |  | 12,599 |  |  |  | 1,977 |
Prepaid service fee |  |  |  |  |  |  | 12,028 |  |  |  | 11,410 |  |  |  | 1,790 |
VAT and other surcharges |  |  |  |  |  |  | 10,467 |  |  |  | 5,618 |  |  |  | 882 |
Investment in a convertible loan |  |  |  |  |  |  | — |  |  |  | 4,221 |  |  |  | 662 |
Loans granted to equity investees | (ii | ) |  |  |  |  | 500 |  |  |  | 3,000 |  |  |  | 471 |
Office rental deposit |  |  |  |  |  |  | 636 |  |  |  | 919 |  |  |  | 144 |
Prepaid media cost |  |  |  |  |  |  | — |  |  |  | 551 |  |  |  | 87 |
Receivables from sales of shares on behalf of employees |  |  |  |  |  |  | 11,060 |  |  |  | 180 |  |  |  | 28 |
Refund from prepaid media cost |  |  |  |  |  |  | 6,838 |  |  |  | — |  |  |  | — |
Others |  |  |  |  |  |  | 7,484 |  |  |  | 8,172 |  |  |  | 1,282 |
Total prepayments and other current assets |  |  |  |  |  |  | 49,013 |  |  |  | 46,670 |  |  |  | 7,323 |

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