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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) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Common Stock Warrant Liability |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | $ 19,071 | $ 139,259 | $ 53,664 | $ 140,590
Change in fair value | 13,748 | (60,316) | (20,845) | (61,647)
Fair value-end of period | 32,819 | $ 78,943 | 32,819 | $ 78,943
Derivative Liabilities | Series A Redeemable Convertible Preferred Stock |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | 394,100 |  | 0 |
Issuance | 0 |  | 497,100 |
Change in fair value | 191,200 |  | 88,200 |
Fair value-end of period | 585,300 |  | 585,300 |
Derivative Liabilities | Series B Redeemable Convertible Preferred Stock |  |  |  |
Level 3 Liabilities [Roll Forward] |  |  |  |
Fair value-beginning of period | 0 |  | 0 |
Issuance | 297,675 |  | 297,675 |
Change in fair value | 49,050 |  | 49,050 |
Fair value-end of period | $ 346,725 |  | $ 346,725 |

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