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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Number of Shares      
Outstanding, at the beginning of the period (in shares)   7,008,833  
Options granted (in shares) 40,000 498,426 440,000
Options exercised (in shares)   (654,388)  
Options forfeited (in shares)   (1,472,366)  
Outstanding, at the end of the period (in shares) 5,380,505 5,380,505  
Vested or expected to vest at the end of the period (in shares) 5,297,443 5,297,443  
Options exercisable at the end of the period (in shares) 3,874,169 3,874,169  
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)   7.04  
Options forfeited (in dollars per share)   10.95  
Outstanding at the end of the period (in dollars per shares) $ 9.49 9.49  
Vested or expected to vest at the end of the period (in dollars per share) 9.45 9.45  
Options exercisable at the end of the period (in dollars per share) $ 9.20 $ 9.20  
Weighted Average Remaining Contractual Term      
Outstanding   5 years 5 months 23 days  
Vested or expected to vest   5 years 5 months 5 days  
Options exercisable   4 years 6 months 29 days  
Aggregate Intrinsic Value      
Outstanding $ 16,061 $ 16,061  
Vested or expected to vest 16,037 16,037  
Options exercisable $ 13,287 $ 13,287  
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) 320,000 320,000