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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
 6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 8,505
Options granted | shares 2,817
Options exercised | shares (308)
Ending balance | shares 10,247
Vested and expected to vest at June 30, 2021 | shares 9,876
Exercisable at June 30, 2021 | shares 5,966
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 11.57
Options granted | $ / shares 9.31
Options exercised | $ / shares 4.69
Ending balance | $ / shares 11.03
Vested and expected to vest at June 30, 2021 | $ / shares 11.12
Exercisable at June 30, 2021 | $ / shares $ 13.04
Weighted-Average Remaining Contractual Term (years)  
Balance at June 30, 2021 4 years 4 months 9 days
Vested and expected to vest at June 30, 2021 4 years 3 months 14 days
Exercisable at June 30, 2021 3 years 10 days
Aggregate Intrinsic Value  
Balance at June 30, 2021 | $ $ 17,136
Vested and expected to vest at June 30, 2021 | $ 16,644
Exercisable at June 30, 2021 | $ $ 9,627
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (376)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 7.74
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (391)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 18.63