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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (17,647) $ (16,215)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 69 60
Equity-based compensation 3,283 2,670
Amortization of right-of-use assets 117 115
Issuance of common stock as commitment shares for equity line financing 318  
Loss on sale of common stock pursuant to purchase agreement with Lincoln Park Capital Fund, LLC 5  
Changes in operating assets and liabilities:    
Grant receivables 2,034 (727)
Prepaid expenses and other assets 957 (1,477)
Other receivables   465
Accounts payable and accrued expenses 1,837 4,482
Deferred grant income and other liabilities (1,426) 2,366
Operating lease liabilities (109) (88)
Net cash used in operating activities (10,562) (8,349)
Cash flows from investing activities:    
Payments for property and equipment (117) (161)
Net cash used in investing activities (117) (161)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options   1,595
Payments on loan payable (632) (1,191)
Net provided by (used in) financing activities 2,082 404
Effect of exchange rate changes on cash and cash equivalents 4 (5)
Net decrease in cash and cash equivalents (8,593) (8,111)
Cash and cash equivalents    
Cash and cash equivalents-beginning of period 41,562 54,721
Cash and cash equivalents-end of period 32,969 46,610
Supplemental disclosures of non-cash financing activities:    
Remeasurement of right-of-use asset and operating lease liability   $ 189
At The Market Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock 2,509  
Equity Line Financing    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 205