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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial instruments and fair value measurements (Details) - Nonrecurring - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Carrying Value |  |
Liabilities: |  |
Long-term investments | $ 77 | $ 73
Level 3 | Fair Value |  |
Liabilities: |  |
Long-term investments | $ 77 | $ 73

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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