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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (9,738) $ (5,482)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 8 18
Amortization of right-of-use asset - operating 85 71
Share-based compensation 43 151
Change in operating assets and liabilities:    
Other current assets (348) 401
Other assets (12)  
Accounts payable 1,101 188
Accrued compensation and employee benefits 686 (21)
Accrued expenses and other liabilities 450 (127)
Net cash used in operating activities (7,725) (4,801)
Cash flows from investing activities:    
Purchase of property and equipment (19) (4)
Net cash used in investing activities (19) (4)
Cash flows from financing activities:    
Proceeds from the issuance of common stock 50,894 7,281
Common stock offering costs (2,034) (372)
Repayment of principal on vendor finance agreement (408) (349)
Net cash provided by financing activities 48,452 6,560
Net increase in cash and cash equivalents 40,708 1,755
Cash and cash equivalents, beginning of year 8,363 6,608
Cash and cash equivalents, end of year 49,071 8,363
Supplemental cash flow information:    
Interest paid 9 7
Income tax refund received 9 167
Supplemental disclosure of noncash investing and financing transactions:    
Leased assets obtained in exchange for operating lease liabilities 491 $ 93
Common stock offering costs accrued but not yet paid $ 254