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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net loss $ (9,937) $ (9,151) $ (6,749) $ (6,172) $ (26,129) $ (17,647) $ (25,788)
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         80 69  
Equity-based compensation         3,214 3,283  
Amortization of right-of-use assets         115 117  
Loss on currency translation from liquidation of subsidiary         195    
Issuance of common stock as commitment shares for equity line financing           318  
Changes in operating assets and liabilities:              
Grant receivables         (2,088) 2,034  
Prepaid expenses and other assets         1,569 962  
Accounts payable and accrued expenses         3,650 1,837  
Deferred grant income and other liabilities         (584) (1,426)  
Operating lease liabilities         (114) (109)  
Net cash used in operating activities         (20,092) (10,562)  
Cash flows from investing activities:              
Payments for property and equipment         (3) (117)  
Net cash used in investing activities         (3) (117)  
Cash flows from financing activities:              
Proceeds from the exercise of common stock options         82    
Payment of employee withholding taxes on vested restricted stock units         (128)    
Payments on loan payable         (544) (632)  
Net cash provided by financing activities         12,184 2,082  
Effect of exchange rate changes on cash and cash equivalents           4  
Net decrease in cash and cash equivalents         (7,911) (8,593)  
Cash and cash equivalents              
Cash and cash equivalents - beginning of period   $ 29,922   $ 41,562 29,922 41,562 41,562
Cash and cash equivalents - end of period $ 22,011   $ 32,969   22,011 32,969 $ 29,922
At The Market Offering              
Cash flows from financing activities:              
Proceeds from issuance of common stock         878 2,509  
Follow-on Public Offering              
Cash flows from financing activities:              
Proceeds from issuance of common stock         $ 11,896    
Equity Line Financing              
Cash flows from financing activities:              
Proceeds from issuance of common stock           $ 205