Quarterly report pursuant to Section 13 or 15(d)

Stock Award Plans (Details 2)

v2.4.0.8
Stock Award Plans (Details 2) (Stock options, USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
item
Sep. 30, 2012
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) 1.50% 0.70% 1.00% 0.90%
Expected term (in years) 5 years 5 years 5 years 4 months 24 days 5 years 6 months
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 69.50% 83.90% 72.50% 81.60%
Additional disclosures        
Options granted (in shares)     3,034,456 2,135,016
Grant-date weighted-average fair value (in dollars per share)     $ 3.40 $ 5.44
Total unrecognized compensation cost, net of estimated forfeitures $ 8.3   $ 8.3  
Shares of common stock available for future grant 9,104,761   9,104,761  
Options exercised during the period (in shares)     0  
Consultants
        
Stock award plans        
Contractual term of the option     10 years