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Prepaid Expenses 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 Prepaid Expenses and Other Current Assets | Prepaid expenses and other current assets consist of the following:
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Prepayments |  |  | 299,154 |  |  |  | 216,264 |  |  |  | 33,937 |
Rental and other deposits |  |  | 10,867 |  |  |  | 20,371 |  |  |  | 3,197 |
Receivables from third-party payment platform |  |  | 86,777 |  |  |  | 9,899 |  |  |  | 1,553 |
Interest receivable |  |  | 114,726 |  |  |  | 1,495 |  |  |  | 235 |
Staff advances |  |  | 2,070 |  |  |  | 1,395 |  |  |  | 219 |
Other receivables |  |  | 49,588 |  |  |  | 30,824 |  |  |  | 4,836 |
|  | 563,182 |  |  | 280,248 |  |  | 43,977 |
Prepayments primarily include prepaid VAT and surcharges, prepaid promotional expenses and service fee.

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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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