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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract]    
Number of Shares, Opening Balance 62,827,150  
Number of Shares, Granted 3,375,940  
Number of Shares, Exercised (9,318,462)  
Number of Shares, Forfeited (2,359,089)  
Number of Shares, Ending Balance 54,525,539 62,827,150
Exercisable and vested 34,618,347  
Weighted Average Exercise Price, Opening Balance $ 4.55  
Weighted Average Exercise Price,Granted 13.89  
Weighted Average Exercise Price,Exercised 2.89  
Weighted Average Exercise Price,Forfeited 6.87  
Weighted Average Exercise Price, Ending Balance 5.30 $ 4.55
Weighted Average Exercise Price, Exercisable and vested $ 4.02  
Weighted Average Remaining Contract Term, Opening Balance 7 years 1 month 6 days 7 years 9 months 18 days
Weighted Average Remaining Contract Term, Ending Balance 7 years 1 month 6 days 7 years 9 months 18 days
Weighted Average Remaining Contract Term, Exercisable and vested 6 years 3 months 18 days  
Aggregate Intrinsic Value $ 221.3 $ 1,208.0
Aggregate Intrinsic Value, Exercisable and vested $ 176.6