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Summary of Company's Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of Shares  
Options Outstanding, Beginning Balance | shares 16,441,994
Granted | shares 1,879,092
Exercised | shares (577,627)
Cancelled/forfeited | shares (2,657,318)
Options Outstanding, Ending Balance | shares 15,086,141
Vested at December 31, 2021 | shares 11,003,784
Unvested at December 31, 2021 | shares 4,082,357
Weighted Average Exercise Prices  
Weighted Average Exercise Prices, Beginning Balance | $ / shares $ 30.40
Weighted Average Exercise Prices, granted | $ / shares 43.62
Weighted Average Exercise Prices, exercised | $ / shares 22.25
Weighted Average Exercise Prices, Cancelled/forfeited | $ / shares 34.83
Weighted Average Exercise Prices, Ending Balance | $ / shares 31.58
Weighted Average Exercise Prices, Vested | $ / shares 30.09
Weighted Average Exercise Prices, Unvested | $ / shares $ 35.60
Weighted average remaining contractual term, Outstanding 5 years 9 months 18 days
Weighted average remaining contractual term, Vested 5 years 1 month 6 days
Weighted average remaining contractual term, Unvested 7 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $ $ 16,416
Aggregate Intrinsic Value, Vested | $ 12,879
Aggregate Intrinsic Value, Unvested | $ $ 3,537