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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Employee Stock Option [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Employee Stock Option [Member]
        
Number of Shares        
Outstanding, at the beginning of the period (in shares)     11,377,146  
Options granted (in shares) 252,232 141,575 2,168,309 1,897,887
Options exercised (in shares)     (808,643)  
Options forfeited (in shares)     (994,532)  
Outstanding, at the end of the period (in shares) 11,742,280   11,742,280  
Vested or expected to vest at the end of the period (in shares) 11,076,127   11,076,127  
Options exercisable at the end of the period (in shares) 6,135,339   6,135,339  
Weighted Average Exercise Price        
Outstanding at the beginning of the year (in dollars per shares)     $ 11.32  
Options granted (in dollars per share)     $ 9.43  
Options exercised (in dollars per share)     $ 7.02  
Options forfeited (in dollars per share)     $ 15.92  
Outstanding at the end of the period (in dollars per shares) $ 10.88   $ 10.88  
Vested or expected to vest at the end of the period (in dollars per share) $ 11.06   $ 11.06  
Options exercisable at the end of the period (in dollars per share) $ 14.14   $ 14.14  
Weighted Average Remaining Contractual Term        
Outstanding     6 years 1 month 2 days  
Vested or expected to vest     5 years 11 months 8 days  
Options exercisable     4 years 2 months 1 day  
Aggregate Intrinsic Value        
Outstanding $ 47,629   $ 47,629  
Vested or expected to vest 44,436   44,436  
Options exercisable $ 17,678   $ 17,678