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Equity Incentive Plans and Stock-Based Compensation (Details 2) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Number of Shares    
Outstanding, at the beginning of the period (in shares) 7,008,833  
Options granted (in shares) 498,426 440,000
Options exercised (in shares) (989,613)  
Options forfeited (in shares) (1,858,653)  
Outstanding, at the end of the period (in shares) 4,658,993  
Vested or expected to vest at the end of the period (in shares) 4,592,934  
Options exercisable at the end of the period (in shares) 3,621,650  
Weighted Average Exercise Price    
Outstanding at the beginning of the year (in dollars per shares) $ 9.34  
Options granted (in dollars per share) 12.74  
Options exercised (in dollars per share) 7.12  
Options forfeited (in dollars per share) 10.54  
Outstanding at the end of the period (in dollars per shares) 9.69  
Vested or expected to vest at the end of the period (in dollars per share) 9.66  
Options exercisable at the end of the period (in dollars per share) $ 9.13  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 7 months 21 days  
Vested or expected to vest 5 years 5 months 16 days  
Options exercisable 4 years 10 months 13 days  
Aggregate Intrinsic Value    
Outstanding $ 19,594  
Vested or expected to vest 19,533  
Options exercisable $ 17,843  
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) 50,000