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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (2,735) $ (4,338)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 6 7
Amortization of other assets   90
Amortization of premiums and discounts on marketable securities 2 55
Share-based compensation 97 101
Change in operating assets and liabilities:    
Other current assets 287 (74)
Accounts payable (14) (234)
Accrued compensation and employee benefits (518) (478)
Accrued expenses and other liabilities (196) 527
Net cash used in operating activities (3,071) (4,344)
Cash flows from investing activities:    
Purchases of property and equipment (1)  
Purchases of marketable securities   (1,542)
Proceeds from maturities of marketable securities 3,050 4,550
Net cash provided by investing activities 3,049 3,008
Cash flows from financing activities:    
Proceeds from the issuance of common stock 3,532 210
Common stock offering costs (116) (105)
Net cash provided by financing activities 3,416 105
Net increase (decrease) in cash and cash equivalents 3,394 (1,231)
Cash and cash equivalents, beginning of period 8,702 7,401
Cash and cash equivalents, end of period 12,096 6,170
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 311 256
Proceeds receivable from the issuance of common stock   11
Common stock offering costs accrued but not yet paid 1 47
Change in unrealized loss on marketable securities $ 2 $ 10