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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (10,898) $ (9,590)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 44 38
Equity-based compensation 2,212 1,893
Amortization of right-of-use assets 77 77
Issuance of common stock as commitment shares for equity line financing 318  
Changes in operating assets and liabilities:    
Grant receivables 1,279 (1,496)
Prepaid expenses and other assets 752 (490)
Accounts payable and accrued expenses 1,165 (948)
Deferred grant income and other liabilities (1,280) 2,222
Operating lease liabilities (70) (51)
Net cash used in operating activities (6,401) (8,345)
Cash flows from investing activities:    
Payments for property and equipment (59) (138)
Net cash used in investing activities (59) (138)
Cash flows from financing activities:    
Proceeds from issuance of common stock under the ATM sales agreement, net of commissions and allocated fees 2,502  
Proceeds from the exercise of common stock options   325
Payments on loan payable (417) (790)
Net provided by (used in) financing activities 2,085 (465)
Effect of exchange rate changes on cash and cash equivalents 3 (2)
Net decrease in cash and cash equivalents (4,372) (8,950)
Cash and cash equivalents    
Cash and cash equivalents-beginning of period 41,562 54,721
Cash and cash equivalents-end of period $ 37,190 $ 45,771