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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale Investments (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost | $ 430,398,000 | $ 383,547
Unrealized Gains |  | 12
Unrealized Losses | (19,328,000) | (3,867)
Fair Value | 411,070,000 | 379,692
U.S. Treasury notes |  |
Amortized Cost | 213,377,000 | 226,020
Unrealized Gains |  | 12
Unrealized Losses | (7,561,000) | (2,136)
Fair Value | 205,816,000 | 223,896
Corporate debt securities |  |
Amortized Cost | 217,021,000 | 157,527
Unrealized Losses | (11,767,000) | (1,731)
Fair Value | $ 205,254,000 | $ 155,796

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