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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (15,214) $ (16,192)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 7 53
Equity-based compensation 1,207 2,318
Amortization of right-of-use assets 99 72
Loss on currency translation from liquidation of subsidiary   195
Changes in operating assets and liabilities:    
Grant receivables (3,599) (1,818)
Prepaid expenses and other assets 653 1,101
Accounts payable and accrued expenses 539 1,348
Deferred grant income and other liabilities 916 (248)
Operating lease liabilities (108) (70)
Net cash used in operating activities (15,500) (13,241)
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
Payment of employee withholding taxes on vested restricted stock units (51) (128)
Payments on loan payable (238) (359)
Net cash provided by financing activities 2,048 11,855
Net decrease in cash and cash equivalents (13,452) (1,389)
Cash and 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 11,557 28,533
At The Market Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 2,337 381
Follow-on Public Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock   $ 11,896