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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (7,541) $ (5,463)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 9 9
Amortization of other assets 117 78
Amortization of premiums and discounts on marketable securities 38  
Share-based compensation 338 305
Change in operating assets and liabilities:    
Other current assets (263) 86
Other assets (303) (224)
Accounts payable 391 (198)
Accrued compensation and employee benefits (569) (127)
Accrued expenses and other liabilities 375 24
Other (1) (2)
Net cash used in operating activities (7,409) (5,512)
Cash flows from investing activities:    
Purchases of property and equipment (2) (7)
Purchases of marketable securities (17,462)  
Proceeds from maturities of marketable securities 450  
Net cash used in investing activities (17,014) (7)
Cash flows from financing activities:    
Proceeds from the issuance of common stock   37,000
Common stock offering costs   (2,611)
Repayment of principal on vendor finance agreement   (138)
Net cash provided by financing activities   34,251
Net (decrease) increase in cash and cash equivalents (24,423) 28,732
Cash and cash equivalents, beginning of period 38,802 15,354
Cash and cash equivalents, end of period 14,379 44,086
Supplemental cash flow information:    
Interest paid   3
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement   55
Common stock offering costs accrued but not yet paid (11) $ 214
Change in unrealized gain on marketable securities 13  
Leasehold improvement lease incentive $ 48