Quarterly report pursuant to Section 13 or 15(d)

Stock Award Plans (Details)

v2.4.0.8
Stock Award Plans (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
item
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
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Sep. 30, 2012
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   $ 2,063 $ 3,245 $ 5,603 $ 9,354
Reduction in workforce (as a percent) 18.00%        
Number of positions eliminated 30        
Period for exercise of vested options for terminated employees, excluding employees covered under restructuring       90 days  
Number of terminated employees whose vesting period for unvested stock options was accelerated       1  
Research and development
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   1,035 1,866 3,060 5,213
General and administrative
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   789 1,379 2,304 4,141
Restructuring charges
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   $ 239   $ 239