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Financial Instruments - Unrealized Losses for Investments in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | $ 10,509 | $ 21,554
12 months or greater, fair value | 52,123 | 74,205
Fair value | 62,632 | 95,759
Less than 12 months, unrealized loss | (86) | (639)
12 months or greater, unrealized loss | (1,392) | (2,992)
Unrealized loss | (1,478) | (3,631)
Corporate bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | 2,509 | 10,639
12 months or greater, fair value | 40,608 | 54,634
Fair value | 43,117 | 65,273
Less than 12 months, unrealized loss | (11) | (440)
12 months or greater, unrealized loss | (1,149) | (2,475)
Unrealized loss | (1,160) | (2,915)
U.S. government treasury bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | 1,995 | 5,262
12 months or greater, fair value | 9,163 | 14,748
Fair value | 11,158 | 20,010
Less than 12 months, unrealized loss | (43) | (177)
12 months or greater, unrealized loss | (192) | (372)
Unrealized loss | (235) | (549)
Asset-backed securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | 1,975 | 2,636
12 months or greater, fair value | 495 | 1,275
Fair value | 2,470 | 3,911
Less than 12 months, unrealized loss | (4) | (17)
12 months or greater, unrealized loss | (3) | (20)
Unrealized loss | (7) | (37)
Municipal bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | 0 | 0
12 months or greater, fair value | 691 | 2,412
Fair value | 691 | 2,412
Less than 12 months, unrealized loss | 0 | 0
12 months or greater, unrealized loss | (10) | (61)
Unrealized loss | (10) | (61)
U.S. government agency bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, fair value | 4,030 | 3,017
12 months or greater, fair value | 1,166 | 1,136
Fair value | 5,196 | 4,153
Less than 12 months, unrealized loss | (28) | (5)
12 months or greater, unrealized loss | (38) | (64)
Unrealized loss | $ (66) | $ (69)

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