Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details)

v2.4.0.8
Stock-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
item
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   $ 2,080 $ 2,063 $ 6,576 $ 5,603
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 Expense [Member]
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   1,151 1,035 3,654 3,060
General And Administrative Expense [Member]
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense   929 789 2,922 2,304
Restructuring Charges [Member]
         
Stock-based compensation expense related to stock-based awards          
Total stock-based compensation expense     $ 239   $ 239