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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	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 339,159	$ 402,664
Gross Unrealized Holding Gains	0	2
Gross Unrealized Holding Losses	(3,492)	(903)
Fair Value	335,667	401,763
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	148,022	183,136
Gross Unrealized Holding Gains	0	2
Gross Unrealized Holding Losses	(1,749)	(492)
Fair Value	146,273	182,646
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,357	68,079
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	0
Fair Value	50,357	68,079
U.S. government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,764	91,840
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(1,388)	(318)
Fair Value	98,376	91,522
Agency bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,279	23,339
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(261)	(64)
Fair Value	23,018	23,275
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,693	27,105
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(33)	(18)
Fair Value	12,660	27,087
Foreign government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,044	9,165
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(61)	(11)
Fair Value	$ 4,983	$ 9,154

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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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