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Equity Plans and Stock-Based Compensation - Option Activity under Stock-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 8,505
Options granted | shares 3,894
Options exercised | shares (1,035)
Ending balance | shares 10,399
Vested and expected to vest at December 31, 2021 | shares 10,029
Exercisable at December 31, 2021 | shares 5,796
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 11.57
Options granted | $ / shares 10.49
Options exercised | $ / shares 6.46
Ending balance | $ / shares 11.55
Vested and expected to vest at December 31, 2021 | $ / shares 11.57
Exercisable at December 31, 2021 | $ / shares $ 13.07
Weighted-Average Remaining Contractual Term (years)  
Balance at December 31, 2021 4 years 1 month 28 days
Vested and expected to vest at December 31, 2021 4 years 29 days
Exercisable at December 31, 2021 2 years 7 months 20 days
Aggregate Intrinsic Value  
Balance at December 31, 2021 | $ $ 42,756
Vested and expected to vest at December 31, 2021 | $ 41,321
Exercisable at December 31, 2021 | $ $ 20,488
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (521)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 8.13
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (444)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 18.48