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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Balance outstanding, beginning (shares) 2,690 873 1,188  
Awarded (shares) 1,979 2,568 332  
Released (shares) (1,197) (361) (363)  
Forfeited (shares) (423) (390) (284)  
Non-vested and outstanding, ending (shares) 3,049 2,690 873  
Expected to vest (shares) 2,059      
Weighted Average Grant Date Fair Value (Per Share)        
Balance outstanding, beginning (in dollars per share) $ 15.81 $ 8.29 $ 8.44  
Awarded (in dollars per share) 30.99 17.02 8.16  
Released (in dollars per share) 14.24 9.49 8.48  
Forfeited (in dollars per share) 20.28 9.49 8.46  
Non-vested and outstanding, ending (in dollars per share) 24.73 $ 15.81 $ 8.29  
Expected to vest (in dollars per share) $ 22.97      
Aggregate Fair Value        
Non-vested and outstanding $ 112,848 $ 50,756 $ 10,053 $ 8,968
Expected to vest $ 76,185