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FAIR VALUE MEASUREMENT - Movements of level 3 fair value measurements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment loss | $ 0 | $ 0 | $ 0
Foreign currency translation adjustment | (9,022,611) | (545,498) | (8,130,208)
Fair Value, Nonrecurring | Significant unobservable inputs (level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair value measurements | 7,501,930 | 7,378,683 |
Additions during the year | 0 | 1,000,000 |
Net unrealized gain (loss) | 600,957 | (876,753) |
Assets, Fair value measurements | $ 8,102,887 | $ 7,501,930 | $ 7,378,683

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