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Equity Incentive Plans and Stock-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 14, 2017
Aggregate Intrinsic Value        
Share Price       $ 14.56
Options        
Number of Shares        
Outstanding, at the beginning of the period (in shares) 4,310,361 7,008,833 8,995,017  
Options granted (in shares) 711,479 558,426 500,000  
Options exercised (in shares) (908,146) (1,278,856) (1,405,077)  
Stock options forfeited (in shares) (877,803) (1,978,042) (1,081,107)  
Outstanding, at the end of the period (in shares) 3,235,891 4,310,361 7,008,833  
Vested or expected to vest at the end of the period (in shares) 3,205,109      
Options exercisable at the end of the period (in shares) 2,656,079      
Weighted Average Exercise Price        
Outstanding at the beginning of the year (in dollars per shares) $ 9.78 $ 9.34 $ 10.01  
Options granted (in dollars per share) 12.84 12.95 12.29  
Options exercised (in dollars per share) 6.70 7.34 7.27  
Options forfeited (in dollars per share) 13.73 10.68 18.98  
Outstanding at the end of the period (in dollars per shares) 10.25 $ 9.78 $ 9.34  
Vested or expected to vest at the end of the period (in dollars per share) 10.22      
Options exercisable at the end of the period (in dollars per share) $ 9.71      
Weighted Average Remaining Contractual Term (in years)        
Outstanding (in years) 4 years 4 days      
Vested or expected to vest (in years) 3 years 11 months 19 days      
Options exercisable (in years) 2 years 11 months 23 days      
Aggregate Intrinsic Value        
Outstanding $ 1,675      
Vested or expected to vest 1,675      
Options exercisable $ 1,675      
Share Price $ 7.67      
Total number of in-the-money outstanding (in shares) 911,788      
Total number of in-the-money exercisable (in shares) 911,788