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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (5,463) $ (4,794)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 9 5
Amortization of deferred charges 78  
Share-based compensation 305 330
Change in operating assets and liabilities:    
Other current assets 86 45
Other assets (224) (701)
Accounts payable (198) 128
Accrued compensation and employee benefits (127) (318)
Accrued expenses and other liabilities 24 (146)
Other (2) 1
Net cash used in operating activities (5,512) (5,450)
Cash flows from investing activities:    
Purchase of property and equipment (7) (5)
Net cash used in investing activities (7) (5)
Cash flows from financing activities:    
Proceeds from the issuance of common stock 37,000 9,038
Common stock offering costs (2,611) (834)
Repayment of principal on vendor finance agreement (138) (128)
Net cash provided by financing activities 34,251 8,076
Net increase in cash and cash equivalents 28,732 2,621
Cash and cash equivalents, beginning of period 15,354 16,756
Cash and cash equivalents, end of period 44,086 19,377
Supplemental cash flow information:    
Interest paid 3 2
Supplemental disclosure of noncash investing and financing transactions:    
Common stock offering costs accrued but not yet paid 214  
Vendor finance agreement $ 55 $ 51