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Stockholders' Equity - Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units        
Expected to vest (shares) 1,939      
Weighted Average Grant Date Fair Value (Per Share)        
Expected to vest (in dollars per share) $ 26.17      
Aggregate Fair Value        
Expected to vest $ 120,674      
RSUs        
Restricted Stock Units        
Beginning balance (shares) 3,049 2,690 873  
Awarded (shares) 2,530 1,979 2,568  
Released (shares) (1,906) (1,197) (361)  
Forfeited (shares) (723) (423) (390)  
Ending balance (shares) 2,950 3,049 2,690  
Weighted Average Grant Date Fair Value (Per Share)        
Beginning balance (in dollars per share) $ 24.73 $ 15.81 $ 8.29  
Awarded (in dollars per share) 26.51 30.99 17.02  
Released (in dollars per share) 23.40 14.24 9.49  
Forfeited (in dollars per share) 25.19 20.28 9.49  
End balance (in dollars per share) $ 27.00 $ 24.73 $ 15.81  
Aggregate Fair Value        
Non-vested and outstanding $ 183,781 $ 112,848 $ 50,756 $ 10,053