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Fair Value Measurements - Backstop Subscription Agreement - Summary of changes in fair value of financial instruments measured on recurring basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance $ 36,435 $ 3,668
Reinstatement of common stock warrants as preferred stock warrants   61
Issuance of Pay-to-Play convertible notes and related warrants   9,282
Common rights offering   142
Issuance of 2023 convertible notes and related warrants 464 12,300
Issuance of Pre-funded common stock warrants 110,718 505
Change in estimated fair value 15,723 10,477
Balance 163,340 36,435
Pay to Play Convertible Notes [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance 14,641 3,139
Issuance of Pay-to-Play convertible notes and related warrants   8,717
Common rights offering   142
Issuance of Pre-funded common stock warrants 0  
Change in estimated fair value 1,301 2,643
Balance 15,942 14,641
2023 Convertible Notes [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance 18,064  
Issuance of 2023 convertible notes and related warrants 0 11,175
Issuance of Pre-funded common stock warrants 105,902  
Change in estimated fair value 8,721 6,889
Balance 132,687 18,064
Warrant Liabilities [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance 3,730 529
Reinstatement of common stock warrants as preferred stock warrants   61
Issuance of Pay-to-Play convertible notes and related warrants   565
Issuance of 2023 convertible notes and related warrants 464 1,125
Issuance of Pre-funded common stock warrants 4,816 505
Change in estimated fair value 5,701 945
Balance $ 14,711 $ 3,730