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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:                
Net loss $ (4,712) $ (4,100) $ (5,125) $ (1,991) $ (1,320) $ (13,646) $ (4,613)  
Adjustments to reconcile net loss to net cash used in operating activities:                
Depreciation           11 6  
Amortization of right-of-use asset - operating           52 71  
Share-based compensation           378 25  
Change in operating assets and liabilities:                
Other current assets           (439) (281)  
Other assets           (6) (12)  
Accounts payable           (405) 83  
Accrued compensation and employee benefits           (670) 92  
Accrued expenses and other liabilities           910 (101)  
Net cash used in operating activities           (13,815) (4,730)  
Cash flows from investing activities:                
Purchases of property and equipment           (36) (6)  
Net cash used in investing activities           (36) (6)  
Cash flows from financing activities:                
Proceeds from the issuance of common stock           24,070 49,644  
Common stock offering costs           (977) (1,905)  
Repayment of principal on vendor finance agreement             (271)  
Net cash provided by financing activities           23,093 47,468  
Net increase in cash and cash equivalents           9,242 42,732  
Cash and cash equivalents, beginning of period   $ 49,071 51,095   $ 8,363 49,071 8,363 $ 8,363
Cash and cash equivalents, end of period $ 58,313   $ 49,071 $ 51,095   58,313 51,095 $ 49,071
Supplemental cash flow information:                
Interest paid             7  
Income tax refund received             9  
Supplemental disclosure of noncash investing and financing transactions:                
Leased assets obtained in exchange for operating lease liabilities           84 49  
Purchases of property and equipment in accrued liabilities           $ 2    
Vendor finance agreement             137  
Common stock offering costs accrued but not yet paid             336  
Proceeds receivable from the issuance of common stock             $ 30