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Cash and Investments - Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Fair Value | $ 967,168 | $ 454,780
Gross Unrealized Losses | (22,328) | (1,730)
Corporate bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Fair Value | 613,122 | 385,053
Gross Unrealized Losses | (15,495) | (1,672)
U.S. Treasury and government-sponsored enterprises |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Fair Value | 301,337 | 18,962
Gross Unrealized Losses | (6,157) | (21)
Commercial paper |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Fair Value | 36,636 | 43,290
Gross Unrealized Losses | (364) | (2)
Municipal bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Fair Value | 16,073 | 7,475
Gross Unrealized Losses | $ (312) | $ (35)

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