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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 | Mar. 31, 2023 | Dec. 31, 2022
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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 | $ 9,907 | $ 31,538
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses | (15) | (170)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value | 88,953 | 159,627
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses | (1,122) | (2,368)
Available for sale securities in continual unrealized loss position, estimated fair value | 98,860 | 191,165
Available for sale securities in continual unrealized loss position, gross unrealized holding losses | (1,137) | (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 | 2,469 | 6,738
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses | (7) | (147)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value | 36,084 | 75,270
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses | (450) | (925)
Available for sale securities in continual unrealized loss position, estimated fair value | 38,553 | 82,008
Available for sale securities in continual unrealized loss position, gross unrealized holding losses | (457) | (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 | 4,955 | 22,326
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses | (1) | (13)
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value | 43,794 | 67,909
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses | (564) | (1,194)
Available for sale securities in continual unrealized loss position, estimated fair value | 48,749 | 90,235
Available for sale securities in continual unrealized loss position, gross unrealized holding losses | (565) | (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 | 0 | 0
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses | 0 | 0
Available for sale securities in continual unrealized loss position, 12 months or more, estimated fair value | 9,075 | 11,468
Available for sale securities in continual unrealized loss position, 12 months or more, gross unrealized holding losses | (108) | (222)
Available for sale securities in continual unrealized loss position, estimated fair value | 9,075 | 11,468
Available for sale securities in continual unrealized loss position, gross unrealized holding losses | (108) | (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 | 2,483 | 2,474
Available for sale securities in continual unrealized loss position, less than 12 months, gross unrealized holding losses | (7) | (10)
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 | 2,483 | 2,474
Available for sale securities in continual unrealized loss position, gross unrealized holding losses | $ (7) | (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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- 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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