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Equity Plans and Stock-Based Compensation - Option Activity under Stock-Based Compensation Plans (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Shares Underlying Outstanding Options    
Beginning balance 10,399  
Options granted 2,053  
Options exercised (1,171)  
Ending balance 9,348 10,399
Vested and expected to vest as of September 30, 2022 9,081  
Exercisable as of September 30, 2022 5,056  
Weighted-Average Exercise Price Per Share    
Beginning balance $ 11.55  
Options granted 12.54  
Options exercised 8.10  
Ending balance 10.75 $ 11.55
Vested and expected to vest as of September 30, 2022 10.70  
Exercisable as of September 30, 2022 $ 10.10  
Weighted-Average Remaining Contractual Term (years)    
Weighted - Average Remaining Contractual Term (years), balance 4 years 10 months 6 days 4 years 1 month 28 days
Vested and expected to vest as of September 30, 2022 4 years 9 months 21 days  
Exercisable as of September 30, 2022 3 years 11 months 12 days  
Aggregate Intrinsic Value    
Balance as of December 31, 2021 $ 42,756  
Balance as of September 30, 2022 15,323 $ 42,756
Vested and expected to vest as of September 30, 2022 15,241  
Exercisable as of September 30, 2022 $ 12,300  
Unvested    
Shares Underlying Outstanding Options    
Options cancelled (105)  
Weighted-Average Exercise Price Per Share    
Options cancelled $ 9.40  
Vested    
Shares Underlying Outstanding Options    
Options cancelled (1,828)  
Weighted-Average Exercise Price Per Share    
Options cancelled $ 19.11