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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (20,144) $ (26,129)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 22 80
Equity-based compensation 1,729 3,214
Amortization of right-of-use assets 145 115
Loss on currency translation from liquidation of subsidiary   195
Changes in operating assets and liabilities:    
Grant receivables 786 (2,088)
Prepaid expenses and other assets 700 1,569
Accounts payable and accrued expenses (4,904) 3,650
Deferred grant income and other liabilities 670 (584)
Operating lease liabilities (155) (114)
Net cash used in operating activities (21,151) (20,092)
Cash flows from investing activities:    
Payments for property and equipment   (3)
Net cash used in investing activities   (3)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options 65 82
Payment of employee withholding taxes on vested RSUs (87) (128)
Payments on loan payable (279) (544)
Net cash provided by financing activities 35,965 12,184
Net increase (decrease) in cash, cash equivalents and restricted cash equivalents 14,814 (7,911)
Cash, cash equivalents, and restricted cash equivalents    
Cash, cash equivalents, and restricted cash equivalents - beginning of period 25,009 29,922
Cash, cash equivalents, and restricted cash equivalents - end of period 39,823 22,011
Supplemental disclosures of non-cash financing activities:    
Issuance costs included in accounts payable and accrued expenses 50  
At The Market Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock 8,326 878
Registered Direct Offerings    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 27,940 $ 11,896