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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (19,322) $ (9,738)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 16 8
Amortization of right-of-use asset - operating 75 85
Share-based compensation 497 43
Change in operating assets and liabilities:    
Other current assets (156) (348)
Other assets (6) (12)
Accounts payable (411) 1,101
Accrued compensation and employee benefits 110 686
Accrued expenses and other liabilities 435 450
Net cash used in operating activities (18,762) (7,725)
Cash flows from investing activities:    
Purchase of property and equipment (43) (19)
Net cash used in investing activities (43) (19)
Cash flows from financing activities:    
Proceeds from the issuance of common stock 24,070 50,894
Common stock offering costs (977) (2,034)
Repayment of principal on vendor finance agreement   (408)
Net cash provided by financing activities 23,093 48,452
Net increase in cash and cash equivalents 4,288 40,708
Cash and cash equivalents, beginning of year 49,071 8,363
Cash and cash equivalents, end of year 53,359 49,071
Supplemental cash flow information:    
Interest paid   9
Income tax refund received   9
Supplemental disclosure of noncash investing and financing transactions:    
Leased assets obtained in exchange for operating lease liabilities $ 84 491
Common stock offering costs accrued but not yet paid   $ 254