v3.19.3.a.u2
Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Weighted-Average Exercise Price    
Weighted-Average Exercise Price, Beginning balance $ 7.83  
Weighted-Average Exercise Price, Granted 14.69  
Weighted-Average Exercise Price, Exercised 3.53  
Weighted-Average Exercise Price, Forfeited 13.87  
Weighted-Average Exercise Price, Ending balance 9.00 $ 7.83
Weighted-Average Exercise Price, Exercisable 8.00  
Weighted-Average Exercise Price, Vested and expected to vest $ 8.91  
Weighted-Average Remaining Contractual Term    
Weighted-Average Remaining Contractual Term (in years) 5 years 7 months 2 days 6 years 4 months 28 days
Weighted-Average Remaining Contractual Term (in years) 4 years 7 months 24 days  
Weighted-Average Remaining Contractual Term (in years) 5 years 6 months 14 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding $ 34,567  
Aggregate Intrinsic Value, Outstanding 75,460 $ 34,567
Aggregate Intrinsic Value, Exercisable 63,445  
Aggregate Intrinsic Value, Vested and expected to vest $ 74,825  
Class A Common Stock    
Number of Shares    
Number of Shares, Beginning balance 13,322  
Number of Shares, Granted 118  
Number of Shares, Exercised (3,291)  
Number of Shares, Forfeited (1,437)  
Number of Shares, Ending balance 8,712 13,322
Number of Shares, Exercisable 6,053  
Number of Shares, Vested and expected to vest 8,508  
Class B Common Stock    
Number of Shares    
Number of Shares, Beginning balance 2,969  
Number of Shares, Exercised (1,389)  
Number of Shares, Forfeited (30)  
Number of Shares, Ending balance 1,550 2,969
Number of Shares, Exercisable 1,550  
Number of Shares, Vested and expected to vest 1,550