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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (3,647) $ (2,744)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 5 4
Amortization of other assets 57 31
Share-based compensation 155 130
Change in operating assets and liabilities:    
Other current assets (277) (139)
Other assets (7)  
Accounts payable 380 (144)
Accrued compensation and employee benefits (517) (206)
Accrued expenses and other liabilities (32) (43)
Other   (2)
Net cash used in operating activities (3,883) (3,113)
Cash flows from investing activities:    
Purchases of property and equipment (1) (2)
Purchases of marketable securities (5,201)  
Net cash used in investing activities (5,202) (2)
Cash flows from financing activities:    
Repayment of principal on vendor finance agreement   (55)
Net cash used in financing activities   (55)
Net decrease in cash and cash equivalents (9,085) (3,170)
Cash and cash equivalents, beginning of period 38,802 15,354
Cash and cash equivalents, end of period 29,717 12,184
Supplemental cash flow information:    
Interest paid   1
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement   $ 138
Change in unrealized gain on marketable securities 6  
Payable for purchases of marketable securities $ 1,009