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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:    
Net loss $ (11,445) $ (9,689)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 19 12
Amortization of deferred charges 189 67
Share-based compensation 599 647
Change in operating assets and liabilities:    
Other current assets 213 214
Other assets (211) (545)
Accounts payable (431) 198
Accrued compensation and employee benefits 340 (130)
Accrued expenses and other liabilities 196 (182)
Other (3) 2
Net cash used in operating activities (10,534) (9,406)
Cash flows from investing activities:    
Purchase of property and equipment (11) (19)
Net cash used in investing activities (11) (19)
Cash flows from financing activities:    
Proceeds from the issuance of common stock 37,000 9,038
Common stock offering costs (2,814) (836)
Repayment of principal on vendor finance agreement (193) (179)
Net cash provided by financing activities 33,993 8,023
Net increase (decrease) in cash and cash equivalents 23,448 (1,402)
Cash and cash equivalents, beginning of period 15,354 16,756
Cash and cash equivalents, end of period 38,802 15,354
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 $ 11