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Common Stock - Initial Public Offering and Authorized Common Shares Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 20, 2018
Class of Stock [Line Items]          
Payments of expenses associated with initial public offering   $ 1,373 $ 0 $ 0  
Public Stock Offering - Shares From Existing Shareholders          
Class of Stock [Line Items]          
Payments of expenses associated with initial public offering   $ 26,130      
Class B Common Stock          
Class of Stock [Line Items]          
Common stock shares authorized (up to) (in shares) 1,800,000,000 1,800,000,000     600,000,000
Common stock shares outstanding (in shares)   260,552,747 243,241,192    
Class B Common Stock | Public Stock Offering - Shares From Existing Shareholders          
Class of Stock [Line Items]          
Number of shares sold (in shares) 12,360,991        
Price per share sold (USD per share) $ 22.00        
Class A Common Stock          
Class of Stock [Line Items]          
Common stock shares authorized (up to) (in shares) 100,000,000 100,000,000     320,000,000
Common stock shares outstanding (in shares)   11,601,757 11,601,757