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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