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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	Sep. 30, 2022	Dec. 31, 2021
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	$ 177,118	$ 328,162
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(2,799)	(903)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	47,209	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(1,258)	0
Available for sale securities in continual unrealized loss position, estimated fair value	224,327	328,162
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(4,057)	(903)
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	79,274	177,124
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(1,275)	(492)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	22,421	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(569)	0
Available for sale securities in continual unrealized loss position, estimated fair value	101,695	177,124
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(1,844)	(492)
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	81,493	91,522
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(1,166)	(318)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	22,309	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(647)	0
Available for sale securities in continual unrealized loss position, estimated fair value	103,802	91,522
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(1,813)	(318)
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	11,401	23,274
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(288)	(64)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	2,479	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	(42)	0
Available for sale securities in continual unrealized loss position, estimated fair value	13,880	23,274
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	(330)	(64)
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	0	27,087
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	0	(18)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	0	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	0	0
Available for sale securities in continual unrealized loss position, estimated fair value	0	27,087
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	0	(18)
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	4,950	9,155
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses	(70)	(11)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value	0	0
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses	0	0
Available for sale securities in continual unrealized loss position, estimated fair value	4,950	9,155
Available for sale securities in continual unrealized loss position, gross unrealized holding losses	$ (70)	$ (11)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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