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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