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Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Fair value, less than 12 months | $ 152,406 | $ 68,557
Unrealized losses, less than 12 months | (2,594) | (1,561)
Fair value, 12 months or greater | 229,640 | 233,304
Unrealized losses, 12 months or greater | (7,073) | (8,994)
Total fair value | 382,046 | 301,861
Total unrealized Losses | (9,667) | (10,555)
Corporate bonds |  |
Debt Securities, Available-for-sale |  |
Fair value, less than 12 months | 95,052 | 30,770
Unrealized losses, less than 12 months | (1,087) | (359)
Fair value, 12 months or greater | 222,979 | 226,643
Unrealized losses, 12 months or greater | (6,896) | (8,807)
Total fair value | 318,031 | 257,413
Total unrealized Losses | (7,983) | (9,166)
Treasury notes |  |
Debt Securities, Available-for-sale |  |
Fair value, less than 12 months | 42,612 | 20,725
Unrealized losses, less than 12 months | (647) | (153)
Fair value, 12 months or greater | 2,441 | 2,441
Unrealized losses, 12 months or greater | (60) | (60)
Total fair value | 45,053 | 23,166
Total unrealized Losses | (707) | (213)
Asset-backed securities |  |
Debt Securities, Available-for-sale |  |
Fair value, less than 12 months | 14,742 | 17,062
Unrealized losses, less than 12 months | (860) | (1,049)
Fair value, 12 months or greater | 2,252 | 2,252
Unrealized losses, 12 months or greater | (48) | (47)
Total fair value | 16,994 | 19,314
Total unrealized Losses | (908) | (1,096)
Sovereign bonds |  |
Debt Securities, Available-for-sale |  |
Fair value, less than 12 months | 0 | 0
Unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or greater | 1,968 | 1,968
Unrealized losses, 12 months or greater | (69) | (80)
Total fair value | 1,968 | 1,968
Total unrealized Losses | $ (69) | $ (80)

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