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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Number of Options      
Balance, beginning of period (in shares) 54,525,539    
Shares purchased under ESPP plan (in shares) 75,376    
Options exercised (in shares) (2,594,589)    
Options forfeited (in shares) (652,838)    
Balance, end of period (in shares) 51,353,488 54,525,539  
Exercisable and vested at end of period (in shares) 33,974,772    
Weighted Average Exercise Price      
Balance, beginning of period (in dollars per share) $ 5.30    
Options granted (in dollars per share) 8.10    
Options exercised (in dollars per share) 2.10    
Options forfeited (in dollars per share) 7.05    
Balance, end of period (in dollars per share) 5.45 $ 5.30  
Exercisable and vested at end of period (in dollars per shares) $ 4.36    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Balance, weighted-average remaining contractual life (in years) 6 years 10 months 24 days 7 years 1 month 6 days  
Exercisable at end of period, weighted-average remaining contractual life (in years) 6 years 3 months 18 days    
Balance, aggregate intrinsic value $ 143.9 $ 221.3  
Exercisable and vested at end of period, aggregate intrinsic value $ 123.8    
Closing stock price (in dollars per share) $ 7,860,000 $ 9,090,000.00  
Outside of 2012 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options early exercised (in shares)     1,061,250