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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (25,788) $ (21,397)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 96 83
Equity-based compensation 4,354 3,572
Amortization of right-of-use assets 156 152
Issuance of common stock as commitment shares for equity line financing 318  
Changes in operating assets and liabilities:    
Grant receivables 2,391 (1,873)
Prepaid expenses and other assets 1,852 (1,302)
Other receivables   467
Accounts payable and accrued expenses 2,440 (749)
Deferred grant income and other liabilities (1,687) 2,635
Operating lease liabilities (150) (121)
Net cash used in operating activities (16,018) (18,533)
Cash flows from investing activities:    
Payments for property and equipment (147) (171)
Net cash used in investing activities (147) (171)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options   1,618
Payments on loan payable (811) (1,396)
Net cash provided by financing activities 4,521 5,546
Effect of exchange rate changes on cash and cash equivalents 4 (1)
Net decrease in cash and cash equivalents (11,640) (13,159)
Cash and cash equivalents    
Cash and cash equivalents-beginning of period 41,562 54,721
Cash and cash equivalents-end of period 29,922 41,562
Supplemental disclosures of non-cash financing activities:    
Prepayment of insurance through third-party financing 721 838
Remeasurement of right-of-use asset and operating lease liability   349
Deferred offering costs included in Accounts payable   140
At The Market Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock 5,127  
Equity Line Financing    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 205  
Follow-on Public Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock   $ 5,324