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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
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 8,505
Options granted | shares 1,996
Options exercised | shares (119)
Ending balance | shares 10,047
Vested and expected to vest at March 31, 2021 | shares 9,693
Exercisable at March 31, 2021 | shares 5,967
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 11.57
Options granted | $ / shares 9.36
Options exercised | $ / shares 4.16
Ending balance | $ / shares 11.15
Vested and expected to vest at March 31, 2021 | $ / shares 11.26
Exercisable at March 31, 2021 | $ / shares $ 13.44
Weighted-Average Remaining Contractual Term (years)  
Balance at March 31, 2021 4 years 3 months 4 days
Vested and expected to vest at March 31, 2021 4 years 2 months 5 days
Exercisable at March 31, 2021 3 years 18 days
Aggregate Intrinsic Value  
Balance at March 31, 2021 | $ $ 17,816
Vested and expected to vest at March 31, 2021 | $ 17,184
Exercisable at March 31, 2021 | $ $ 8,975
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (171)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 7.50
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (164)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 19.67