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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (4,851) $ (9,860)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 11 14
Amortization of other assets   179
Amortization of premiums and discounts on marketable securities 2 91
Share-based compensation 157 220
Change in operating assets and liabilities:    
Other current assets 483 102
Accounts payable (217) (141)
Accrued compensation and employee benefits (623) (578)
Accrued expenses and other liabilities (287) 671
Net cash used in operating activities (5,325) (9,302)
Cash flows from investing activities:    
Purchases of property and equipment (1) (2)
Purchases of marketable securities   (2,039)
Proceeds from maturities of marketable securities 3,050 11,150
Net cash provided by investing activities 3,049 9,109
Cash flows from financing activities:    
Proceeds from the issuance of common stock 3,532 2,284
Common stock offering costs (117) (221)
Repayment of principal on vendor finance agreement (206) (170)
Net cash provided by financing activities 3,209 1,893
Net increase in cash and cash equivalents 933 1,700
Cash and cash equivalents, beginning of period 8,702 7,401
Cash and cash equivalents, end of period 9,635 9,101
Supplemental cash flow information:    
Interest paid 6 4
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 105 86
Purchases of property and equipment in accounts payable 1  
Proceeds receivable from the issuance of common stock   (198)
Common stock offering costs accrued but not yet paid   82
Change in unrealized loss on marketable securities $ 2 $ 14