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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Cash flows used in operating activities:      
Net loss $ (4,116) $ (2,720)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 147 88  
Amortization of deferred financing costs and debt discount 115 151  
Change in fair value of liability instruments (1) (2)  
Share-based compensation expense 180 107  
Non-cash lease expense (10) 1  
Increases (decreases) in cash caused by changes in operating assets and liabilities:      
Other current assets 459 (170)  
Accounts payable and accrued expenses (650) (461)  
Net cash used in operating activities (3,876) (3,006)  
Cash flows used in investing activities:      
Purchases of property and equipment (210) (84)  
Purchase of intangible assets (117) 0  
In process research and development acquired (250) 0  
Net cash used in investing activities (577) (84)  
Cash flows from financing activities:      
Principal payments of long-term obligations (402) 0  
Payment of financing lease liability 0 (6)  
Proceeds from exercise of warrants 0 2,017  
Proceeds from sale of common stock 7,694 7,180  
Net cash provided by financing activities 7,292 9,191  
Net increase in cash and cash equivalents 2,839 6,101  
Cash and cash equivalents at beginning of period 18,400 8,346 $ 8,346
Cash and cash equivalents at end of period 21,239 14,447 $ 18,400
Cash paid during period for:      
Interest 87 96  
Supplemental schedule of non-cash investing and financing activities:      
Unpaid offering cost $ 171 $ 102