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ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2025
ACCOUNTS RECEIVABLE |
Schedule of accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Accounts receivable |  | 94,052 | ​ | 90,205 | ​ | 12,899
Allowance for credit losses |  | (42,884) | ​ | (46,156) | ​ | (6,600)
Accounts receivable, net |  | 51,168 | ​ | 44,049 | ​ | 6,299
​ The roll forward in the allowance for credit losses were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Balance at the beginning of the year |  | 7,764 | ​ | 30,486 | ​ | 42,884 | ​ | 6,132
Provisions for the year | ​ | 22,752 | ​ | 12,857 | ​ | 3,994 | ​ | 571
Reversal of provisions from prior periods due to subsequent cash collection during the year | ​ | (30) | ​ | (420) | ​ | — | ​ | —
Amounts written off during the year |  | — | ​ | (39) | ​ | (722) | ​ | (103)
Balance at the end of the year |  | 30,486 | ​ | 42,884 | ​ | 46,156 | ​ | 6,600

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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