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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Balance outstanding, beginning (shares) 873 1,188 1,202  
Awarded (shares) 2,568 332 571  
Released (shares) (361) (363) (394)  
Forfeited (shares) (390) (284) (191)  
Non-vested and outstanding, ending (shares) 2,690 873 1,188  
Expected to vest (shares) 1,875      
Weighted Average Grant Date Fair Value (Per Share)        
Balance outstanding, beginning (in dollars per share) $ 8.29 $ 8.44 $ 10.31  
Awarded (in dollars per share) 17.02 8.16 6.32  
Released (in dollars per share) 9.49 8.48 10.31  
Forfeited (in dollars per share) 9.49 8.46 10.01  
Non-vested and outstanding, ending (in dollars per share) 15.81 $ 8.29 $ 8.44  
Expected to vest (in dollars per share) $ 14.83      
Aggregate Fair Value        
Non-vested and outstanding $ 50,756 $ 10,053 $ 8,968 $ 6,220
Expected to vest $ 35,357      
Vesting period (in years) 4 years