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Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Options    
Outstanding at the beginning of the period (in shares) 5,089  
Granted (in shares) 437  
Exercised (in shares) (138)  
Forfeited (in shares) (560)  
Outstanding at the end of the period (in shares) 4,828 5,089
Vested and expected to vest at the end of the period (in shares) 4,553  
Exercisable at the end of the period (in shares) 3,453  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding at the beginning of the period (in dollars per share) $ 9.82  
Granted (in dollars per share) 12.48  
Exercised (in dollars per share) 7.91  
Forfeited (in dollars per share) 15.63  
Outstanding at the end of the period (in dollars per share) 9.44 $ 9.82
Vested and expected to vest at the end of the period (in dollars per share) 9.16  
Exercisable at the end of the period (in dollars per share) $ 7.58  
Weighted Average Remaining Contractual Term    
Outstanding 6 years 3 days 6 years 10 months 9 days
Vested and expected to vest 5 years 10 months 28 days  
Exercisable 5 years 2 months 23 days  
Aggregate Intrinsic Value    
Outstanding $ (1,880) $ 51,556
Vested and expected to vest (488)  
Exercisable $ 5,082