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, 2023	Dec. 31, 2022
Shares Underlying Outstanding Options
Beginning balance	9,339
Options granted	1,968
Options exercised	(556)
Options cancelled	(83)
Options cancelled	(260)
Ending balance	10,408	9,339
Vested and expected to vest as of September 30, 2023	10,211
Exercisable as of September 30, 2023	6,843
Weighted-Average Exercise Price Per Share
Beginning balance	$ 10.7
Options granted	11.14
Options exercised	7.8
Options cancelled	10.96
Options cancelled	21.42
Ending balance	10.66	$ 10.7
Vested and expected to vest as of June 30, 2023	10.65
Exercisable as of June 30, 2023	$ 10.17
Weighted-Average Remaining Contractual Term (years)
Weighted - Average Remaining Contractual Term (years), balance	4 years 4 months 17 days	4 years 7 months 9 days
Vested and expected to vest as of June 30, 2023	4 years 4 months 6 days
Exercisable as of June 30, 2023	3 years 7 months 20 days
Aggregate Intrinsic Value
Balance as of December 31, 2022	$ 16,291
Balance as of June 30, 2023	46,599	$ 16,291
Vested and expected to vest as of June 30, 2023	45,949
Exercisable as of June 30, 2023	$ 34,772