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Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 274,396	$ 402,664
Gross Unrealized Holding Gains	1	2
Gross Unrealized Holding Losses	(4,057)	(903)
Estimated Fair Value	270,340	401,763
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	103,539	183,136
Gross Unrealized Holding Gains	0	2
Gross Unrealized Holding Losses	(1,844)	(492)
Estimated Fair Value	101,695	182,646
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,589	68,079
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	38,589	68,079
U.S. government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	110,559	91,840
Gross Unrealized Holding Gains	1	0
Gross Unrealized Holding Losses	(1,813)	(318)
Estimated Fair Value	108,747	91,522
Agency bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,210	23,339
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(330)	(64)
Estimated Fair Value	13,880	23,275
Foreign government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,020	9,165
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(70)	(11)
Estimated Fair Value	4,950	9,154
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,479	27,105
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	(18)
Estimated Fair Value	$ 2,479	$ 27,087

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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