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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss $ (7,933) $ (18,490)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 22 27
Amortization of other assets   329
Amortization of premiums and discounts on marketable securities 2 119
Share-based compensation 273 458
Change in operating assets and liabilities:    
Other current assets 689 437
Accounts payable (392) (583)
Accrued compensation and employee benefits (607) 38
Accrued expenses and other liabilities (298) 193
Net cash used in operating activities (8,244) (17,472)
Cash flows from investing activities:    
Purchase of property and equipment (4) (3)
Purchases of marketable securities   (5,471)
Proceeds from maturities of marketable securities 3,050 18,400
Net cash provided by investing activities 3,046 12,926
Cash flows from financing activities:    
Proceeds from the issuance of common stock 3,532 6,551
Common stock offering costs (117) (448)
Repayment of principal on vendor finance agreement (311) (256)
Net cash provided by financing activities 3,104 5,847
Net (decrease) increase in cash and cash equivalents (2,094) 1,301
Cash and cash equivalents, beginning of year 8,702 7,401
Cash and cash equivalents, end of year 6,608 8,702
Supplemental cash flow information:    
Interest paid 8 6
Income tax refund received 54 38
Supplemental disclosure of noncash investing and financing transactions:    
Common stock offering costs accrued but not yet paid   7
Change in unrealized loss on marketable securities $ 2 $ 17