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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (8,277) $ (7,078)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 14 8
Amortization of deferred charges 133 34
Share-based compensation 454 491
Change in operating assets and liabilities:    
Other current assets 147 132
Other assets (229) (452)
Accounts payable (167) (232)
Accrued compensation and employee benefits (215) (360)
Accrued expenses and other liabilities 229 (72)
Other (3) 2
Net cash used in operating activities (7,914) (7,527)
Cash flows from investing activities:    
Purchase of property and equipment (9) (5)
Net cash used in investing activities (9) (5)
Cash flows from financing activities:    
Proceeds from the issuance of common stock 37,000 9,038
Common stock offering costs (2,756) (834)
Repayment of principal on vendor finance agreement (193) (179)
Net cash provided by financing activities 34,051 8,025
Net increase in cash and cash equivalents 26,128 493
Cash and cash equivalents, beginning of period 15,354 16,756
Cash and cash equivalents, end of period 41,482 17,249
Supplemental cash flow information:    
Interest paid 4 $ 3
Supplemental disclosure of noncash investing and financing transactions:    
Common stock offering costs accrued but not yet paid $ 69