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Stock Based Compensation (Allocated Stock-based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 35 $ 108 $ 73 $ 235
General and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 162 514 352 1,043
Continuing Operations        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 197 $ 622 $ 425 $ 1,278