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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (2,622) $ (3,100)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 4 11
Amortization of right-of-use asset - operating 47 32
Share-based compensation 20 95
Change in operating assets and liabilities:    
Other current assets 95 161
Accounts payable (103) (13)
Accrued compensation and employee benefits 23 (36)
Accrued expenses and other liabilities (192) 94
Net cash used in operating activities (2,728) (2,756)
Cash flows from investing activities:    
Purchases of property and equipment (6)  
Net cash used in investing activities (6)  
Cash flows from financing activities:    
Proceeds from the issuance of common stock 6,061 6,517
Common stock offering costs (514) (287)
Repayment of principal on vendor finance agreement (135) (116)
Net cash provided by financing activities 5,412 6,114
Net increase in cash and cash equivalents 2,678 3,358
Cash and cash equivalents, beginning of period 8,363 6,608
Cash and cash equivalents, end of period 11,041 9,966
Supplemental cash flow information:    
Interest paid 4 3
Income tax refund received 9 109
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 273 233
Common stock offering costs accrued but not yet paid 250 68
Leased assets obtained in exchange for operating lease liabilities, upon extension and adoption $ 49 $ 60