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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Schedule of Reconciliation of Common Stock Warrant Liability and Derivative Liability Measured and Recorded at Fair Value on a Recurring Basis (Details) - Derivative Liabilities - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Series A Derivative Liability |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | $ 5,900 | $ 232,100 | $ 10,800 | $ 408,800
Issuance | 0 |  | 0 |
Change in fair value | (5,200) | (76,900) | (10,100) | (253,600)
Fair value-end of period | 700 | 155,200 | 700 | 155,200
Series B Derivative Liability |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | 2,925 | 125,625 | 5,400 | 230,625
Issuance | 0 |  | 0 |
Change in fair value | (2,550) | (34,575) | (5,025) | (139,575)
Fair value-end of period | 375 | 91,050 | 375 | 91,050
Series C Derivative Liability |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | 0 | 6,653 | 0 | 19,514
Issuance | 115,390 |  | 115,390 |
Change in fair value | 47,190 | (5,322) | 47,190 | (18,183)
Fair value-end of period | $ 162,580 | $ 1,331 | $ 162,580 | $ 1,331

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