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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net loss $ (5,482) $ (7,933)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 18 22
Amortization of right-of-use asset - operating 71  
Amortization of premiums and discounts on marketable securities   2
Share-based compensation 151 273
Change in operating assets and liabilities:    
Other current assets 401 689
Accounts payable 188 (392)
Accrued compensation and employee benefits (21) (607)
Accrued expenses and other liabilities (127) (298)
Net cash used in operating activities (4,801) (8,244)
Cash flows from investing activities:    
Purchase of property and equipment (4) (4)
Proceeds from maturities of marketable securities   3,050
Net cash (used in) provided by investing activities (4) 3,046
Cash flows from financing activities:    
Proceeds from the issuance of common stock 7,281 3,532
Common stock offering costs (372) (117)
Repayment of principal on vendor finance agreement (349) (311)
Net cash provided by financing activities 6,560 3,104
Net (decrease) increase in cash and cash equivalents 1,755 (2,094)
Cash and cash equivalents, beginning of year 6,608 8,702
Cash and cash equivalents, end of year 8,363 6,608
Supplemental cash flow information:    
Interest paid 7 8
Income tax refund received 167 54
Supplemental disclosure of noncash investing and financing transactions:    
Leased assets obtained in exchange for operating lease liabilities, upon adoption and extension $ 93  
Change in unrealized loss on marketable securities   $ 2