Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details 2)

v2.4.0.8
Stock-based Compensation (Details 2) (Employee Stock Option [Member], USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
item
Sep. 30, 2013
Stock award plans        
Number of homogenous groups for purposes of determining fair values of options     3  
Contractual term of the option     10 years  
Weighted-average assumptions relating to options granted        
Risk-free interest rate (as a percent) 2.20% 1.50% 2.20% 1.00%
Expected term (in years) 6 years 5 years 6 years 7 months 6 days 5 years 4 months 24 days
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 67.10% 69.50% 74.90% 72.50%
Additional disclosures        
Options granted (in shares)     3,424,510 3,034,456
Grant-date weighted-average fair value (in dollars per share)     $ 2.34 $ 3.40
Total unrecognized compensation cost, net of estimated forfeitures $ 8.7   $ 8.7  
Shares of common stock available for future grant 7,230,986   7,230,986  
Options exercised during the period (in shares)     11,219  
Consultant [Member]
        
Stock award plans        
Contractual term of the option     10 years  
Recipient Of Performance Shares [Member]
        
Additional disclosures        
Options granted (in shares)     950,000