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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Cash flows used in operating activities:              
Net loss $ (1,482) $ (4,805) $ (5,282) $ (4,116) $ (6,287) $ (9,398)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         318 302  
Amortization of deferred financing costs and debt discount         119 218  
Change in fair value of liability instruments         (1)  
Loss on disposal of property and equipment         2  
Stock-based compensation expense         280 347  
Amortization of operating lease right-of-use assets         57 38  
Increases (decreases) in cash caused by changes in operating assets and liabilities:              
Grant Receivable         718  
Other current assets         1,510 525  
Accounts payable and accrued expenses         (3,589) 1,527  
Change in operating lease liabilities         (56) (74)  
Deferred revenue         (1,643)  
Net cash used in operating activities         (8,571) (6,516)  
Cash flows used in investing activities:              
Purchases of property and equipment         (108) (348)  
Purchase of intangible assets         (117)  
In process research and development acquired         (250)  
Net cash used in investing activities         (108) (715)  
Cash flows from financing activities:              
Principal payments of term loan obligation         (804) (804)  
Proceeds from sale of common stock, net         2,258 7,725  
Net cash provided by financing activities         1,454 6,921  
Net decrease in cash and cash equivalents         (7,225) (310)  
Cash and cash equivalents at beginning of period   $ 18,120   $ 18,400 18,120 18,400 $ 18,400
Cash and cash equivalents at end of period $ 10,895   $ 18,090   10,895 18,090 $ 18,120
Cash paid during period for:              
Interest         135 168  
Supplemental schedule of non-cash investing and financing activities:              
Unpaid offering cost         $ 35 $ 50