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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Cash flows from operating activities:          
Net loss $ (3,272) $ (5,676) $ (4,834) $ (4,100)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Depreciation 5     3  
Amortization of right-of-use asset - operating 23     14  
Share-based compensation 167     141  
Loss from disposal of property and equipment 2        
Change in operating assets and liabilities:          
Other current assets (414)     (840)  
Accounts payable (103)     56  
Accrued compensation and employee benefits (757)     (560)  
Accrued expenses and other liabilities 51     61  
Net cash used in operating activities (4,298)     (5,225)  
Cash flows from investing activities:          
Purchases of property and equipment (2)     (6)  
Net cash used in investing activities (2)     (6)  
Cash flows from financing activities:          
Proceeds from the issuance of common stock       24,070  
Common stock offering costs       (977)  
Net cash provided by financing activities       23,093  
Net (decrease) increase in cash and cash equivalents (4,300)     17,862  
Cash and cash equivalents, beginning of period 53,359   $ 66,933 49,071 $ 49,071
Cash and cash equivalents, end of period $ 49,059 $ 53,359   66,933 $ 53,359
Supplemental disclosure of noncash investing and financing transactions:          
Purchases of property and equipment in accrued liabilities       $ 3