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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
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Shares Underlying Outstanding Options    
Beginning balance 10,399  
Options granted 1,793  
Options exercised (155)  
Ending balance 11,974 10,399
Vested and expected to vest as of March 31, 2022 11,494  
Exercisable as of March 31 2022 6,473  
Weighted-Average Exercise Price Per Share    
Beginning balance $ 11.55  
Options granted 12.70  
Options exercised 7.24  
Ending balance 11.71 $ 11.55
Vested and expected to vest as of March 31, 2022 11.70  
Exercisable as of March 31 2022 $ 12.48  
Weighted-Average Remaining Contractual Term (years)    
Weighted - Average Remaining Contractual Term (years), balance 4 years 6 months 29 days 4 years 1 month 28 days
Vested and expected to vest as of March 31, 2022 4 years 3 months 21 days  
Exercisable as of March 31 2022 3 years 1 month 2 days  
Aggregate Intrinsic Value    
Balance as of December 31, 2021 $ 42,756  
Balance as of March 31, 2022 20,270 $ 42,756
Vested and expected to vest as of March 31, 2022 19,947  
Exercisable as of March 31 2022 $ 13,042  
Unvested    
Shares Underlying Outstanding Options    
Options cancelled (25)  
Weighted-Average Exercise Price Per Share    
Options cancelled $ 9.40  
Vested    
Shares Underlying Outstanding Options    
Options cancelled (38)  
Weighted-Average Exercise Price Per Share    
Options cancelled $ 35.48