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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Cash flows used in operating activities:      
Net loss $ (3,261) $ (4,805)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 155 158  
Amortization of deferred financing costs and debt discount 16 66  
Share-based compensation expense 146 140  
Accretion of discount on short-term investments 1    
Reduction in the carrying amount of operating lease right-of-use assets 31 29  
Loss on disposal of property and equipment   2  
Increases (decreases) in cash caused by changes in operating assets and liabilities:      
Other current assets 150 2,791  
Accounts payable and accrued expenses (43) (3,639)  
Change in operating lease liabilities (31) (29)  
Deferred grant liability (1,677) (506)  
Net cash used in operating activities (4,513) (5,793)  
Cash flows used in investing activities:      
Purchases of property and equipment (40) (97)  
Purchase of short-term investments (324)    
Net cash used in investing activities (364) (97)  
Cash flows used in/provided by financing activities:      
Principal payments of term loan obligation (402) (402)  
Purchase of treasury stock (374)    
Proceeds from sale of common stock, net   895  
Net cash (used in) provided by financing activities (776) 493  
Net decrease in cash and cash equivalents (5,653) (5,397)  
Cash and cash equivalents at beginning of period 8,554 18,120 $ 18,120
Cash and cash equivalents at end of period 2,901 12,723 $ 8,554
Cash paid during period for:      
Interest 23 73  
Supplemental schedule of non-cash investing and financing activities:      
Unpaid offering cost $ 141 25  
Right-of-use assets obtained in exchange for operating lease liability   $ 51