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Common Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Jan. 01, 2020
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Withholding tax adjustment     $ 14,515 $ 942,780  
Aggregate unrecognized compensation cost     $ 1,100,000    
Aggregate grant-date fair value, weighted average period     2 years 6 months    
2019 Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of earnings for purchase of common stock   15.00%      
Offering periods   12 months      
Common stock reserved for issuance (in shares) 3,025,957       6,000,000
Increase in number of shares reserved for future issuance (in shares) 7,000,000        
Percentage of common stock outstanding 1.00%        
Performance based restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     250,000    
Granted (in dollars per share)     $ 27.14    
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     23,854,000    
Granted (in dollars per share)     $ 27.82    
Shares withheld related to net share settlement (in shares)     408,637    
Withholding tax adjustment     $ 14,500    
Employee Stock | 2019 Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares repurchased under ESPP (in shares)     866,518