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Stock-based Compensation - Schedule of Stock Options Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of
Options    
Beginning Balance (in shares) | shares 15,274  
Granted (in shares) | shares 2,766  
Exercised (in shares) | shares (203)  
Cancelled/forfeited (in shares) | shares (6)  
Ending Balance (in shares) | shares 17,831 15,274
Vested and expected to vest at end of period (in shares) | shares 17,821  
Exercisable at end of period (in shares) | shares 7,724  
Weighted-
Average
Exercise
Price    
Beginning Balance (in dollars per share) | $ / shares $ 10.47  
Granted (in dollars per share) | $ / shares 14.15  
Exercised (in dollars per share) | $ / shares 1.15  
Cancelled/forfeited (in dollars per share) | $ / shares 1.04  
Ending Balance (in dollars per share) | $ / shares 11.15 $ 10.47
Vested and expected to vest at end of period (in dollars per share) | $ / shares 11.15  
Exercisable at end of period (in dollars per share) | $ / shares $ 9.09  
Weighted-
Average
Remaining
Contractual
Life
(in Years) 8 years 1 month 6 days 8 years
Vested and expected to vest at end of period, term 8 years 1 month 6 days  
Exercisable at end of period, term 7 years 6 months  
Aggregate
Intrinsic
Value | $ $ 66,773 $ 97,094
Vested and expected to vest at end of period | $ 66,704  
Exercisable at ending period | $ $ 39,034