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Prepaid Expenses and Other Current Assets | 12 Months Ended
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Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Prepaid Expenses and Other Current Assets |
5. | 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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