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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, 2017
Mar. 31, 2016
Number of Shares    
Outstanding, at the beginning of the period (in shares) 7,008,833  
Options granted (in shares) 458,426 440,000
Options exercised (in shares) (324,985)  
Options forfeited (in shares) (860,206)  
Outstanding, at the end of the period (in shares) 6,282,068  
Vested or expected to vest at the end of the period (in shares) 6,175,245  
Options exercisable at the end of the period (in shares) 4,060,026  
Weighted Average Exercise Price    
Outstanding at the beginning of the year (in dollars per shares) $ 9.34  
Options granted (in dollars per share) 12.80  
Options exercised (in dollars per share) 7.03  
Options forfeited (in dollars per share) 14.55  
Outstanding at the end of the period (in dollars per shares) 9.00  
Vested or expected to vest at the end of the period (in dollars per share) 8.96  
Options exercisable at the end of the period (in dollars per share) $ 8.99  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 5 months 27 days  
Vested or expected to vest 5 years 5 months 9 days  
Options exercisable 4 years 6 months 18 days  
Aggregate Intrinsic Value    
Outstanding $ 29,538  
Vested or expected to vest 29,335  
Options exercisable $ 20,333  
Stock Options with Market Condition [Member]    
Number of Shares    
Outstanding, at the beginning of the period (in shares) 1,135,000  
Outstanding, at the end of the period (in shares) 915,000