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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (6,444) $ (14,293)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 17 21
Amortization of other assets   269
Amortization of premiums and discounts on marketable securities 2 109
Share-based compensation 215 339
Change in operating assets and liabilities:    
Other current assets 522 186
Accounts payable (405) 29
Accrued compensation and employee benefits (573) (526)
Accrued expenses and other liabilities (235) 590
Net cash used in operating activities (6,901) (13,276)
Cash flows from investing activities:    
Purchases of property and equipment (4) (2)
Purchases of marketable securities   (5,471)
Proceeds from maturities of marketable securities 3,050 13,650
Net cash provided by investing activities 3,046 8,177
Cash flows from financing activities:    
Proceeds from the issuance of common stock 3,532 6,515
Common stock offering costs (117) (419)
Repayment of principal on vendor finance agreement (206) (256)
Net cash provided by financing activities 3,209 5,840
Net (decrease) increase in cash and cash equivalents (646) 741
Cash and cash equivalents, beginning of period 8,702 7,401
Cash and cash equivalents, end of period 8,056 8,142
Supplemental cash flow information:    
Interest paid 6 6
Income tax refund received 31  
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 105  
Change in unrealized loss on marketable securities $ 2 $ 16