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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net loss $ (7,041) $ (9,151) $ (4,726) $ (6,172) $ (16,192) $ (10,898) $ (25,788)
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         53 44  
Equity-based compensation         2,318 2,212  
Amortization of right-of-use assets         72 77  
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         (1,818) 1,279  
Prepaid expenses and other assets         1,101 752  
Accounts payable and accrued expenses         1,348 1,165  
Deferred grant income and other liabilities         (248) (1,280)  
Operating lease liabilities         (70) (70)  
Net cash used in operating activities         (13,241) (6,401)  
Cash flows from investing activities:              
Payments for property and equipment         (3) (59)  
Net cash used in investing activities         (3) (59)  
Cash flows from financing activities:              
Proceeds from the exercise of common stock options         65    
Payment of employee withholding taxes on vested restricted stock units         (128)    
Payments on loan payable         (359) (417)  
Net cash provided by (used in) financing activities         11,855 2,085  
Effect of exchange rate changes on cash and cash equivalents           3  
Net decrease in cash and cash equivalents         (1,389) (4,372)  
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 $ 28,533   $ 37,190   28,533 37,190 $ 29,922
At The Market Offering              
Cash flows from financing activities:              
Proceeds from issuance of common stock         381 $ 2,502  
Follow-on Public Offering              
Cash flows from financing activities:              
Proceeds from issuance of common stock         $ 11,896