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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of stock options exercised $ 0.1 $ 2.4 $ 9.7
Unrecognized compensation expense $ 36.0    
Unrecognized compensation expense, recognition period 1 year 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.06 $ 1.88 $ 4.38
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00%
Performance Based Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.74%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   99.11%  
Share based Compensation Arrangement by Share based Payment Award Fair Value Assumptions Expected Forfeiture Rate   5.62%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based Compensation Arrangement by Share based Payment Award Fair Value Assumptions Expected Forfeiture Rate [1]   16.33% 16.33%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 7 years 5 months 16 days 7 years 3 months 11 days 7 years 4 months 2 days
Maximum [Member] | Performance Based Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.92  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3 years 6 months    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based Compensation Arrangement by Share based Payment Award Fair Value Assumptions Expected Forfeiture Rate [1]   0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 4 years 1 month 20 days 4 years 2 months 19 days 3 years 11 months 23 days
Minimum [Member] | Performance Based Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.74  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 1 year 4 months 6 days    
2005 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum term of options 10 years    
Minimum grant price, percent of common stock fair value 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0    
2005 Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
2005 Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 months    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for issuance 808,425    
Employee Stock Ownership Plan (ESOP), Plan Description the Company adopted an Employee Stock Purchase Plan (the ESPP), which currently authorizes an aggregate of 3,450,000 shares of common stock to be purchased, and the aggregate amount of shares will continue to increase 5% on each anniversary of its adoption up to a maximum of 4,000,000 shares. The number of authorized shares and the maximum number of shares both include an increase of 1,000,000 shares approved at the Companys 2016 annual meeting of stockholders. The ESPP allows employees to purchase shares of common stock of the Company at each purchase date through payroll deductions of up to a maximum of 15% of their compensation, at 85% of the lesser of the market price of the shares at the time of purchase or the market price on the beginning date of an option period (or, if later, the date during the option period when the employee was first eligible to participate).    
2015 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for issuance 36,000,000    
Aggregate intrinsic value of stock options outstanding $ 0.1    
Weighted-average remaining contractual term of stock options outstanding 7 years 8 months 12 days    
Aggregate intrinsic value of stock options exercisable $ 0.1    
Weighted-average remaining contractual term of stock options exercisable 6 years 2 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 12,411,543    
[1] See Note 3 regarding the Company’s adoption of ASU 2016-09 in 2017.