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Equity Incentive Plans and Stock-Based Compensation (Details 2) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Number of Shares      
Outstanding, at the beginning of the period (in shares)   11,441,646  
Options granted (in shares) 252,232 362,335 2,168,309
Options exercised (in shares)   (926,418)  
Options forfeited (in shares)   (1,401,928)  
Outstanding, at the end of the period (in shares)   9,475,635  
Vested or expected to vest at the end of the period (in shares)   9,087,205  
Options exercisable at the end of the period (in shares)   5,571,712  
Weighted Average Exercise Price      
Outstanding at the beginning of the year (in dollars per shares)   $ 10.73  
Options granted (in dollars per share)   11.27  
Options exercised (in dollars per share)   7.61  
Options forfeited (in dollars per share)   18.32  
Outstanding at the end of the period (in dollars per shares)   9.93  
Vested or expected to vest at the end of the period (in dollars per share)   9.99  
Options exercisable at the end of the period (in dollars per share)   $ 11.60  
Weighted Average Remaining Contractual Term      
Outstanding   6 years  
Vested or expected to vest   5 years 11 months 1 day  
Options exercisable   4 years 9 months 29 days  
Aggregate Intrinsic Value      
Outstanding   $ 36,128  
Vested or expected to vest   34,808  
Options exercisable   $ 19,105