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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Cash flows from operating activities:      
Net loss $ (8,480) $ (9,151) $ (33,971)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization (9) 27  
Equity-based compensation 586 1,171  
Amortization of right-of-use assets 54 31  
Loss on currency translation from liquidation of subsidiary   195  
Changes in operating assets and liabilities:      
Grant receivables (2,092) 420  
Prepaid expenses and other assets 200 583  
Accounts payable and accrued expenses (75) (377)  
Deferred grant income and other liabilities   (117)  
Operating lease liabilities (61) (26)  
Net cash used in operating activities (9,877) (7,244)  
Cash flows from financing activities:      
Payment of employee withholding taxes on vested restricted stock units (46) (106)  
Payments on loan payable (118) (178)  
Net cash provided by financing activities 1,296 11,993  
Net (decrease) increase in cash and cash equivalents (8,581) 4,749  
Cash and cash equivalents      
Cash and cash equivalents - beginning of period 25,009 29,922 29,922
Cash and cash equivalents - end of period 16,428 34,671 $ 25,009
At The Market Offering      
Cash flows from financing activities:      
Proceeds from issuance of common stock $ 1,460 381  
Follow-on Public Offering      
Cash flows from financing activities:      
Proceeds from issuance of common stock   $ 11,896