Stock Based Compensation (Components of Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
Research and Development Expense [Member] | |||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Stock-based compensation | $ 350 | $ 484 | $ 754 |
Selling, General and Administrative Expenses [Member] | |||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Stock-based compensation | 1,591 | 4,903 | 2,150 |
Continuing Operations [Member] | |||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Stock-based compensation | $ 1,941 | $ 5,387 | $ 2,904 |