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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Allowance for doubtful receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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