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PREPAID EXPENSES AND OTHER CURRENT ASSETS - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid external R&D costs | $ 2,771 | $ 1,609
Prepaid external manufacturing costs | 132 | 398
Prepaid insurance | 1,048 | 609
Prepaid subscriptions | 1,244 | 947
Interest and dividend receivable | 507 | 555
Prepaid consultants | 21 | 1,207
Refunds due from contract research organizations | 544 | 14,480
Other | 760 | 2,397
Total prepaid expenses and other current assets | $ 7,027 | $ 22,202

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