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Equity Incentive Plans and Stock-Based Compensation (Details 2) - Employee Stock Option [Member] - Plan Name [Domain] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Number of Shares      
Outstanding, at the beginning of the period (in shares)   11,441,646  
Options granted (in shares) 118,615 362,335 1,916,077
Options exercised (in shares)   (780,858)  
Options forfeited (in shares)   (1,369,490)  
Outstanding, at the end of the period (in shares)   9,653,633  
Vested or expected to vest at the end of the period (in shares)   9,277,512  
Options exercisable at the end of the period (in shares)   5,317,747  
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)   7.74  
Options forfeited (in dollars per share)   18.56  
Outstanding at the end of the period (in dollars per shares)   9.88  
Vested or expected to vest at the end of the period (in dollars per share)   9.90  
Options exercisable at the end of the period (in dollars per share)   $ 11.71  
Weighted Average Remaining Contractual Term      
Outstanding   6 years 3 months 4 days  
Vested or expected to vest   6 years 2 months 1 day  
Options exercisable   4 years 10 months 28 days  
Aggregate Intrinsic Value      
Outstanding   $ 58,097  
Vested or expected to vest   56,120  
Options exercisable   $ 28,210