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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
Mar. 31, 2016
Mar. 31, 2015
Number of Shares    
Outstanding, at the beginning of the period (in shares) 8,995,017  
Options granted (in shares) 440,000 362,335
Options exercised (in shares) (550,229)  
Options forfeited (in shares) (470,134)  
Outstanding, at the end of the period (in shares) 8,414,654  
Vested or expected to vest at the end of the period (in shares) 8,129,382  
Options exercisable at the end of the period (in shares) 5,139,627  
Weighted Average Exercise Price    
Outstanding at the beginning of the year (in dollars per shares) $ 10.01  
Options granted (in dollars per share) 12.31  
Options exercised (in dollars per share) 6.82  
Options forfeited (in dollars per share) 15.02  
Outstanding at the end of the period (in dollars per shares) 10.06  
Vested or expected to vest at the end of the period (in dollars per share) 10.12  
Options exercisable at the end of the period (in dollars per share) $ 11.39  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 9 months  
Vested or expected to vest 5 years 8 months 5 days  
Options exercisable 4 years 7 months 28 days  
Aggregate Intrinsic Value    
Outstanding $ 43,807  
Vested or expected to vest 42,263  
Options exercisable $ 24,873