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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options - $ / shares
shares in Thousands
 9 Months Ended
Sep. 30, 2021
Shares Under Option  
Outstanding at the beginning of the period (in shares) 26,481
Granted (in shares) 1,171
Exercised (in shares) (5,004)
Cancelled (in shares) (1,186)
Outstanding at the end of the period (in shares) 21,462
Exercisable as of September 30, 2021 13,962
Weighted-Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) $ 10.73
Granted (in dollars per share) 74.52
Exercised (in dollars per share) 7.91
Cancelled (in dollars per share) 18.20
Outstanding at the end of the period (in dollars per share) 14.45
Exercisable as of September 30, 2021 $ 7.97