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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:                  
Net loss $ (4,834) $ (4,100) $ (5,125) $ (1,991) $ (1,302) $ (1,320) $ (8,934) $ (2,622)  
Adjustments to reconcile net loss to net cash used in operating activities:                  
Depreciation             6 4  
Amortization of right-of-use asset - operating             30 47  
Share-based compensation             274 20  
Change in operating assets and liabilities:                  
Other current assets             (697) 95  
Other assets             (6)    
Accounts payable             661 (103)  
Accrued compensation and employee benefits             (609) 23  
Accrued expenses and other liabilities             330 (192)  
Net cash used in operating activities             (8,945) (2,728)  
Cash flows from investing activities:                  
Purchases of property and equipment             (22) (6)  
Net cash used in investing activities             (22) (6)  
Cash flows from financing activities:                  
Proceeds from the issuance of common stock             24,070 6,061  
Common stock offering costs             (977) (514)  
Repayment of principal on vendor finance agreement               (135)  
Net cash provided by financing activities             23,093 5,412  
Net increase in cash and cash equivalents             14,126 2,678  
Cash and cash equivalents, beginning of period   $ 49,071   $ 11,041   $ 8,363 49,071 8,363 $ 8,363
Cash and cash equivalents, end of period $ 63,197   $ 49,071   $ 11,041   63,197 11,041 $ 49,071
Supplemental cash flow information:                  
Interest paid               4  
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 accounts payable and accrued liabilities             $ 8    
Vendor finance agreement               273  
Common stock offering costs accrued but not yet paid               $ 250