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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
item
Jun. 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) 0.90% 0.80% 0.80% 0.90%
Expected term (in years) 6 years 5 years 9 months 18 days 5 years 6 months 5 years 6 months
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 83.80% 80.10% 73.90% 81.60%
Additional disclosures        
Options granted (in shares)     2,109,941 2,134,605
Grant-date weighted-average fair value (in dollars per share)     $ 4.00 $ 5.44
Total unrecognized compensation cost, net of estimated forfeitures $ 8.1   $ 8.1  
Shares of common stock available for future grant 8,896,872   8,896,872  
Options exercised during the period (in shares)     0  
Consultants
        
Stock award plans        
Contractual term of the option     10 years