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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 ($) | 4 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 22, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance | $ 36,435,000 | $ 36,435,000 | $ 3,668,000
Reinstatement of common stock warrants as preferred stock warrants |  |  | 61,000
Issuance of Pay-to-Play convertible notes and related warrants |  |  | 9,282,000
Common rights offering |  |  | 142
Issuance of 2023 convertible notes and related warrants |  | 464,000 | 12,300,000
Issuance of Pre-funded common stock warrants |  | 110,718 | 505
Change in estimated fair value |  | 15,723,000 | 10,477,000
Balance |  | 163,340,000 | 36,435,000
Pay to Play Convertible Notes [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance | 14,641,000 | 14,641,000 | 3,139,000
Issuance of Pay-to-Play convertible notes and related warrants |  |  | 8,717,000
Common rights offering |  |  | 142
Issuance of Pre-funded common stock warrants |  | 0 |
Change in estimated fair value |  | 1,301,000 | 2,643,000
Balance |  | 15,942,000 | 14,641,000
2023 Convertible Notes [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance | 18,064,000 | 18,064,000 |
Issuance of 2023 convertible notes and related warrants |  | 0 | 11,175,000
Issuance of Pre-funded common stock warrants |  | 105,902 |
Change in estimated fair value |  | 8,721,000 | 6,889,000
Balance |  | 132,687,000 | 18,064,000
Warrant Liabilities [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance | 3,730,000 | 3,730,000 | 529,000
Reinstatement of common stock warrants as preferred stock warrants |  |  | 61,000
Issuance of Pay-to-Play convertible notes and related warrants |  |  | 565,000
Issuance of 2023 convertible notes and related warrants |  | 464,000 | 1,125,000
Issuance of Pre-funded common stock warrants |  | 4,816 | 505
Change in estimated fair value |  | 5,701,000 | 945,000
Balance |  | 14,711,000 | $ 3,730,000
Derivative Financial Instruments Liabilities | Backstop Subscription Agreement | BURTECH ACQUISITION CORP [Member] | Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Initial Measurement | $ 361,124 |  |
Change in estimated fair value |  | (361,124) |
Ending Balance |  | 0 |
Derivative Financial Instruments Liabilities | Non-Redemption Agreement | BURTECH ACQUISITION CORP [Member] | Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Initial Measurement |  | 1,084,963 |
Ending Balance |  | $ 1,084,963 |

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