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Fair Value of Financial Instruments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale investments, continuous loss position for less than twelve months | $ 63,473 | $ 383,736
Fair value of available-for-sale investments, continuous loss position for twelve months or greater | 170,682 | 285,676
Total fair value of available-for-sale investments, continuous loss position | 234,155 | 669,412
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale investments, continuous loss position for less than 12 months, gross unrealized losses | (354) | (5,923)
Available-for-sale investments, continuous loss position for 12 months or greater, gross unrealized losses | (2,773) | (7,631)
Available-for-sale investments, total gross unrealized losses | (3,127) | (13,554)
Corporate debt securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale investments, continuous loss position for less than twelve months | 13,876 | 307,085
Fair value of available-for-sale investments, continuous loss position for twelve months or greater | 132,920 | 185,467
Total fair value of available-for-sale investments, continuous loss position | 146,796 | 492,552
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale investments, continuous loss position for less than 12 months, gross unrealized losses | (13) | (5,297)
Available-for-sale investments, continuous loss position for 12 months or greater, gross unrealized losses | (1,865) | (4,090)
Available-for-sale investments, total gross unrealized losses | (1,878) | (9,387)
Government debt securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale investments, continuous loss position for less than twelve months | 49,597 | 76,651
Fair value of available-for-sale investments, continuous loss position for twelve months or greater | 37,762 | 100,209
Total fair value of available-for-sale investments, continuous loss position | 87,359 | 176,860
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale investments, continuous loss position for less than 12 months, gross unrealized losses | (341) | (626)
Available-for-sale investments, continuous loss position for 12 months or greater, gross unrealized losses | (908) | (3,541)
Available-for-sale investments, total gross unrealized losses | $ (1,249) | $ (4,167)

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