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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
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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