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DEBT - Summary of Composition of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Disclosure [Abstract] |  |
Outstanding principal | $ 60,000 | $ 35,000
Accrued final payment fees | 1,856 | 1,925
Less debt discounts | (2,573) | (971)
Total debt, net | 59,283 | 35,954
Less current portion |  | (13,125)
Long-term debt, net | $ 59,283 | $ 22,829

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