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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
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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 | $ 9,971 | $ 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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