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Fair Value Measurements - Schedule of Changes in Fair Values (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | $ 145 | $ 4,030 | $ 821 | $ 2,373 | $ 2,373 | $ 741
Fair value upon issuance | 14,827 |  | 14,827 |  |  | 834
Change in fair value | $ (8,121) | $ (2,126) | $ (8,797) | $ (447) | $ (548) | $ 821
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fair Value Adjustment of Warrants | Fair Value Adjustment of Warrants | Fair Value Adjustment of Warrants | Fair Value Adjustment of Warrants | Fair Value Adjustment of Warrants | Fair Value Adjustment of Warrants
Exercise of warrants |  | $ (53) |  | $ (75) | $ (75) | $ (23)
Derecognition of liability to equity |  | (929) |  | (929) | (929) |
Ending Balance | $ 6,851 | 922 | $ 6,851 | 922 | 821 | 2,373
Preferred Stock Warrants (as Converted to Common) |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 110 | 2,679 | 642 | 1,777 | 1,777 | 510
Fair value upon issuance |  |  |  |  |  | 834
Change in fair value | (55) | (1,571) | (587) | (647) | (720) | 456
Exercise of warrants |  | (53) |  | (75) | (75) | (23)
Derecognition of liability to equity |  | (340) |  | (340) | (340) |
Ending Balance | 55 | 715 | 55 | 715 | 642 | 1,777
Common Stock Warrants |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 35 | 1,351 | 179 | 596 | 596 | 231
Change in fair value | (19) | (555) | (163) | 200 | 172 | 365
Exercise of warrants |  | 0 |  |  |  |
Derecognition of liability to equity |  | (589) |  | (589) | (589) |
Ending Balance | 16 | 207 | 16 | 207 | 179 | 596
Private Placement Warrants |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair value upon issuance | 1,670 |  | 1,670 |  |  |
Change in fair value | (860) |  | (860) |  |  |
Ending Balance | 810 |  | 810 |  |  |
Public Offering Warrants |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair value upon issuance | 13,157 |  | 13,157 |  |  |
Change in fair value | (7,187) |  | (7,187) |  |  |
Ending Balance | 5,970 |  | 5,970 |  |  |
Public Warrants |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 89,524 | 23,638 | 67,699 | 178 | 178 | 159
Fair value upon issuance |  | 105,530 | 49,100 | 131,714 | 133,609 |
Change in fair value | 7,054 | (10,357) | (24,447) | (12,581) | (17,147) | 19
Change in fair value - OCI | (8,870) |  | (3,590) |  | 700 |
Repayments of debt | (1,404) | (10,250) | (2,458) | (10,750) |  |
Payments |  |  |  |  | (11,842) |
Derecognition of liability to equity |  | (37,799) |  | (37,799) | (37,799) |
Ending Balance | 86,304 | 70,762 | 86,304 | 70,762 | 67,699 | 178
Public Warrants | Success Fee Derivative Liability |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 14 | 213 | 14 | 178 | 178 | 159
Change in fair value |  | (201) |  | (166) | (164) | 19
Ending Balance | 14 | 12 | 14 | 12 | 14 | $ 178
Public Warrants | 2023 Convertible Notes |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 16,793 |  |  |  |
Fair value upon issuance |  | 9,150 |  | 28,700 | 28,700 |
Change in fair value |  | 6,008 |  | 3,751 | 3,751 |
Repayments of debt |  | (10,250) |  | (10,750) |  |
Payments |  |  |  |  | (10,750) |
Derecognition of liability to equity |  | (21,701) |  | (21,701) | (21,701) |
Public Warrants | PubCo Share Liability |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 3,327 |  |  |  |
Fair value upon issuance |  |  |  | 3,370 | 3,370 |
Change in fair value |  | (599) |  | (642) | (642) |
Derecognition of liability to equity |  | (2,728) |  | (2,728) | (2,728) |
Public Warrants | Base PubCo and Backstop Share Liability |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 3,305 |  |  |  |
Fair value upon issuance |  |  |  | 3,264 | 3,264 |
Change in fair value |  | 10,065 |  | 10,106 | 10,106 |
Derecognition of liability to equity |  | (13,370) |  | (13,370) | (13,370) |
Public Warrants | Term Loan Derivative Liability |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | 1,895 |  |  |
Fair value upon issuance |  |  |  |  | 1,895 |
Change in fair value |  |  | (1,895) |  |  |
Ending Balance | 0 |  | 0 |  | 1,895 |
Public Warrants | Revenue Interest Financing |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 39,000 |  | 36,200 |  |  |
Fair value upon issuance |  | 40,000 |  | 40,000 | 40,000 |
Change in fair value | 6,704 | (3,400) | 5,358 | (3,400) | (3,408) |
Change in fair value - OCI | (5,800) |  | (600) |  | 700 |
Repayments of debt | (1,404) |  | (2,458) |  |  |
Payments |  |  |  |  | (1,092) |
Ending Balance | 38,500 | 36,600 | 38,500 | 36,600 | 36,200 |
Public Warrants | PIPE Conversion Derivative |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 5,450 |  | 5,600 |  |  |
Fair value upon issuance |  | 3,340 |  | 3,340 | 3,340 |
Change in fair value | 4,400 | 2,100 | 4,250 | 2,100 | 2,260 |
Ending Balance | 9,850 | 5,440 | 9,850 | 5,440 | 5,600 |
Public Warrants | Earn-Out Liability |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 4,110 |  | 23,990 |  |  |
Fair value upon issuance |  | 53,040 |  | 53,040 | 53,040 |
Change in fair value | (2,260) | (24,330) | (22,140) | (24,330) | (29,050) |
Ending Balance | 1,850 | $ 28,710 | 1,850 | $ 28,710 | $ 23,990 |
Public Warrants | RTW Convertible Notes |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 40,950 |  |  |  |  |
Fair value upon issuance |  |  | 49,100 |  |  |
Change in fair value | (1,790) |  | (10,020) |  |  |
Change in fair value - OCI | (3,070) |  | (2,990) |  |  |
Ending Balance | $ 36,090 |  | $ 36,090 |  |  |

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