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Prepayments and other current assets | 12 Months Ended
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Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Prepayments and other current assets |
4 | Prepayments and other current assets
Prepayments and other current assets consist of the following:
|  |  |  |  | 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 |
(i) | Starting from January 1, 2021, the Company has fully exited the Targeted Marketing business and this balance represents the receivables the Company acts as agent and collects on behalf of third party advertising companies for targeted marketing related services.
(ii) | For the years ended December 31, 2019, 2020 and 2021, the Company recognized impairment charges on loans granted to equity investees of nil, RMB4,500 and RMB528 (US$83) . The Company evaluates the impairment of the equity investments without readily determinable fair value along with loans the Company granted to those investees.

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- Definition The entire disclosure for other current assets. + References No definition available. + Details
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