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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost | $ 410,390 | $ 383,547
Unrealized Gains | 1,248 | 12
Unrealized Losses | (24,687) | (3,867)
Fair Value | 386,951 | 379,692
US Treasury Notes Securities |  |
Amortized Cost | 199,626 | 226,020
Unrealized Gains | 5 | 12
Unrealized Losses | (8,913) | (2,136)
Fair Value | 190,718 | 223,896
Corporate Debt Securities |  |
Amortized Cost | 210,764 | 157,527
Unrealized Gains | 1,243 |
Unrealized Losses | (15,774) | (1,731)
Fair Value | $ 196,233 | $ 155,796

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