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ACCOUNTS RECEIVABLE, NET (Tables) | 12 Months Ended
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Dec. 31, 2023
ACCOUNTS RECEIVABLE, NET |
Schedule of accounts receivable, net | Accounts receivable consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | As of December 31,
​ | ​ |  | 2022 | ​ |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable | ​ | $ | 3,089 | ​ | $ | 2,813
Less: Allowance for credit losses | ​ |  | (1,106) | ​ |  | (533)
Accounts receivable, net | ​ | $ | 1,983 | ​ | $ | 2,280
Schedule of allowance for credit losses | Allowance for credit losses: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2022 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (1,086) | ​ | $ | (1,106)
Addition | ​ |  | (235) | ​ |  | (389)
Written off | ​ |  | 215 | ​ |  | 193
Reclassification allowance to the other non-current assets (Note i) | ​ | ​ | — | ​ | ​ | 769
Balance at end of year | ​ | $ | (1,106) | ​ | $ | (533)
​ ​ (Note i) The balance reflects the reclassification of BSC’s provision to non-current assets. Refer to the Note 9-Other non-current assets, net

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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