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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Allowance for doubtful receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Financial Guarantee | Variable Interest Entity |  |
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |
Guarantor obligations, maximum exposure | $ 11,163 | $ 25,257
Prepaid expenses and other current assets |  |
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |
Allowance for credit losses | $ 2,929 | $ 1,873

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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