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SIGNIFICANT ACCOUNTING POLICIES - Deferred revenue (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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SIGNIFICANT ACCOUNTING POLICIES |  |
Deferred revenue - current | $ 8,491 | $ 8,619
Deferred revenue - noncurrent | 7 | 5
Total deferred revenue | $ 8,498 | $ 8,624

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