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Accounts and notes receivable, net | 12 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Accounts receivable, net |
3 | Accounts and notes receivable, net
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts and notes receivable |  |  | 88,706 |  |  |  | 81,550 |  |  |  | 12,797 |
Less: allowance for doubtful accounts |  |  | (43,820 | ) |  |  | (37,690 | ) |  |  | (5,914 | )
Total accounts and notes receivable, net |  |  | 44,886 |  |  |  | 43,860 |  |  |  | 6,883 |
The following table presents the movement in the allowance for doubtful accounts:
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Balance at beginning of year |  |  | 28,516 |  |  |  | 43,820 |  |  |  | 6,876 |
Provisions |  |  | 18,732 |  |  |  | (246 | ) |  |  | (39 | )
Write-offs |  |  | (3,428 | ) |  |  | (5,884 | ) |  |  | (923 | )
Balance at end of year |  |  | 43,820 |  |  |  | 37,690 |  |  |  | 5,914 |

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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