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ACCOUNTS RECEIVABLE | 12 Months Ended
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Dec. 31, 2024
ACCOUNTS RECEIVABLE |
ACCOUNTS RECEIVABLE | 7.ACCOUNTS RECEIVABLE ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2023 | ​ | 2024 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Accounts receivable |  | 103,982 | ​ | 94,052 | ​ | 12,885
Allowance for credit losses |  | (30,486) | ​ | (42,884) | ​ | (5,875)
Accounts receivable, net |  | 73,496 | ​ | 51,168 | ​ | 7,010
​ The roll forward in the allowance for credit losses were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Balance at the beginning of the year |  | 4,932 | ​ | 7,764 | ​ | 30,486 | ​ | 4,177
Provisions for the year | ​ | 2,832 | ​ | 22,752 | ​ | 12,857 | ​ | 1,761
Reversal of provisions from prior periods due to subsequent cash collection during the year | ​ | — | ​ | (30) | ​ | (420) | ​ | (58)
Amounts written off during the year |  | — | ​ | — | ​ | (39) | ​ | (5)
Balance at the end of the year |  | 7,764 | ​ | 30,486 | ​ | 42,884 | ​ | 5,875
​ Provisions for allowance for doubtful debts are recorded in “general and administrative expenses” in the consolidated statements of comprehensive loss. Accounts receivable with carrying value of RMB13,312 and RMB14,745 (US$2,020) were used to secure certain bank and other borrowings as at December 31, 2023 and 2024 respectively (note 19).

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- Definition The entire disclosure for claims held for amounts due to entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/310-10/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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- References No definition available. + Details
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