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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale debt securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost | $ 383,547 | $ 23,179
Unrealized Gains | 12 | 173
Unrealized Losses | (3,867) | (43)
Fair Value | 379,692 | 23,309
U.S. Treasury notes |  |
Amortized Cost | 226,020 | 23,179
Unrealized Gains | 12 | 173
Unrealized Losses | (2,136) | (43)
Fair Value | 223,896 | $ 23,309
Corporate debt securities |  |
Amortized Cost | 157,527 |
Unrealized Losses | (1,731) |
Fair Value | $ 155,796 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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