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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Weighted-Average Exercise Price    
Weighted-Average Exercise Price, Beginning balance $ 9.00  
Weighted-Average Exercise Price, Granted 17.83  
Weighted-Average Exercise Price, Exercised 7.52  
Weighted-Average Exercise Price, Forfeited 13.17  
Weighted-Average Exercise Price, Ending balance $ 9.60 $ 9.00
Weighted-Average Remaining Contractual Term    
Weighted-Average Remaining Contractual Term (in years) 5 years 2 months 19 days 5 years 7 months 2 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding $ 75,460  
Aggregate Intrinsic Value, Outstanding $ 97,375 $ 75,460
Class A Common Stock    
Number of Shares    
Number of Shares, Beginning balance 8,712  
Number of Shares, Granted 2  
Number of Shares, Exercised (2,744)  
Number of Shares, Forfeited (119)  
Number of Shares, Ending balance 5,851 8,712
Class B Common Stock    
Number of Shares    
Number of Shares, Beginning balance 1,550  
Number of Shares, Exercised (393)  
Number of Shares, Ending balance 1,157 1,550