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 |