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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Cash flows used in operating activities:      
Net loss $ (4,805) $ (4,116)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 158 147  
Amortization of deferred financing costs and debt discount 66 115  
Change in fair value of liability instruments 0 (1)  
Stock-based compensation expense 140 180  
Amortization of operating lease right-of-use assets 29 25  
Loss on disposal of property and equipment 2 0  
Increases (decreases) in cash caused by changes in operating assets and liabilities:      
Other current assets 2,791 459  
Accounts payable and accrued expenses (3,639) (650)  
Change in operating lease liabilities (29) (35)  
Deferred revenue (506) 0  
Net cash used in operating activities (5,793) (3,876)  
Cash flows used in investing activities:      
Purchases of property and equipment (97) (210)  
Purchase of intangible assets 0 (117)  
In process research and development acquired 0 (250)  
Net cash used in investing activities (97) (577)  
Cash flows from financing activities:      
Principal payments of term loan obligation (402) (402)  
Proceeds from sale of common stock, net 895 7,694  
Net cash provided by financing activities 493 7,292  
Net (decrease) increase in cash and cash equivalents (5,397) 2,839  
Cash and cash equivalents at beginning of period 18,120 18,400 $ 18,400
Cash and cash equivalents at end of period 12,723 21,239 $ 18,120
Cash paid during period for:      
Interest 73 87  
Supplemental schedule of non-cash investing and financing activities:      
Unpaid offering cost 25 171  
Right-of-use assets obtained in exchange for operating lease liability $ 51 $ 0