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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (6,172) $ (3,838)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 21 18
Equity-based compensation 1,187 1,001
Amortization of right-of-use assets 39 38
Issuance of common stock as commitment shares for equity line financing 318  
Changes in operating assets and liabilities:    
Grant receivables 2,063 (995)
Prepaid expenses and other assets (72) (1,082)
Accounts payable and accrued expenses (75) (539)
Deferred grant income and other liabilities 22 2,429
Operating lease liabilities (36) (20)
Net cash used in operating activities (2,705) (2,988)
Cash flows from investing activities:    
Payments for property and equipment (41) (134)
Net cash used in investing activities (41) (134)
Cash flows from financing activities:    
Proceeds from the ATM 197  
Proceeds from the exercise of common stock options   303
Payments on loan payable (207) (394)
Net cash used in financing activities (10) (91)
Effect of exchange rate changes on cash and cash equivalents 4 1
Net (decrease) in cash and cash equivalents (2,752) (3,212)
Cash and cash equivalents    
Cash and cash equivalents-beginning of period 41,562 54,721
Cash and cash equivalents-end of period $ 38,810 $ 51,509