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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Cash flows from operating activities:                
Net loss $ (2,333) $ (3,272) $ (5,676) $ (4,712) $ (4,100) $ (8,752) $ (13,646)  
Adjustments to reconcile net loss to net cash used in operating activities:                
Depreciation           15 11  
Amortization of right-of-use asset - operating           70 52  
Share-based compensation           436 378  
Loss from disposal of property and equipment           5    
Change in operating assets and liabilities:                
Other current assets           451 (439)  
Other assets             (6)  
Accounts payable           (524) (405)  
Accrued compensation and employee benefits           (592) (670)  
Accrued expenses and other liabilities           (527) 910  
Net cash used in operating activities           (9,418) (13,815)  
Cash flows from investing activities:                
Purchases of property and equipment           (2) (36)  
Net cash used in investing activities           (2) (36)  
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           (9,420) 9,242  
Cash and cash equivalents, beginning of period   $ 53,359 58,313   $ 49,071 53,359 49,071 $ 49,071
Cash and cash equivalents, end of period $ 43,939   $ 53,359 $ 58,313   $ 43,939 58,313 $ 53,359
Supplemental disclosure of noncash investing and financing transactions:                
Leased assets obtained in exchange for operating lease liabilities             84  
Purchases of property and equipment in accrued liabilities             $ 2