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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

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