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ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCOUNTS RECEIVABLE |
Schedule of Accounts Receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2020 | ​ | 2021 | ​ | 2021
​ |  | RMB |  | RMB |  | US$
Accounts receivable |  | 83,848 |  | 132,831 | ​ | 20,844
Allowance for credit losses |  | (6,473) |  | (4,932) |  | (774)
Accounts receivable, net |  | 77,375 |  | 127,899 | ​ | 20,070
​ The rollforward in the allowance for credit losses were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2019 | ​ | 2020 | ​ | 2021 | ​ | 2021
​ |  | RMB |  | RMB |  | RMB |  | US$
Balance at the beginning of the year |  | 3,585 |  | 7,147 |  | 6,473 |  | 1,016
Cumulative effect of adopting ASU 2016-13 | ​ | — | ​ | 597 | ​ | — | ​ | —
Disposal of subsidiary | ​ | — | ​ | (60) | ​ | — | ​ | —
Provisions for the year |  | 4,510 |  | 1,879 |  | 1,463 |  | 230
Reversal of provisions from prior periods due to subsequent cash collection during the year |  | (221) |  | (1,415) |  | (983) |  | (154)
Amounts written off during the year |  | (734) |  | (1,675) |  | (2,021) |  | (318)
Foreign exchange gain or loss |  | 7 |  | — |  | — |  | —
Balance at the end of the year |  | 7,147 |  | 6,473 |  | 4,932 |  | 774

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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