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Balance Sheet Components - Summary of Available for Sale Securities in Unrealized Loss Position, Fair Value and Gross Unrealized Loss By Length of Time Security in Continual Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value	$ 9,971	$ 31,538
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(1)	(170)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	3,495	159,627
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(5)	(2,368)
Available for sale securities in continual unrealized loss position, estimated fair value	13,466	191,165
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(6)	(2,538)
Corporate bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value	0	6,738
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	0	(147)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	3,495	75,270
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(5)	(925)
Available for sale securities in continual unrealized loss position, estimated fair value	3,495	82,008
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(5)	(1,072)
U.S. government bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value	4,984	22,326
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	0	(13)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	0	67,909
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	0	(1,194)
Available for sale securities in continual unrealized loss position, estimated fair value	4,984	90,235
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	0	(1,207)
Agency bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value	4,987	0
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(1)	0
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	0	11,468
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	0	(222)
Available for sale securities in continual unrealized loss position, estimated fair value	4,987	11,468
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	$ (1)	(222)
Asset-backed securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value		2,474
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses		(10)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value		0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses		0
Available for sale securities in continual unrealized loss position, estimated fair value		2,474
Available for sale securities in continual unrealized loss position, gross unrealized holding losses		(10)
Foreign government bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Available for sale securities in continual unrealized loss position, less than 12 months, estimated fair value		0
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses		0
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value		4,980
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses		(27)
Available for sale securities in continual unrealized loss position, estimated fair value		4,980
Available for sale securities in continual unrealized loss position, gross unrealized holding losses		$ (27)

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