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Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Cash, Cash Equivalents and Short-Term Investments |  |
Due within one year, Amortized Cost | $ 42,087,000 | $ 14,084
Due between one and two years, Amortized Cost |  | 9,095
Total, Amortized Cost | 197,149,000 | 23,179
Due within one year, Fair Value | 42,085,000 | 14,111
Due between one and two years, Fair Value |  | 9,198
Due between one and five years, Fair Value | 153,657,000 |
Due between one and five years, Amortized Cost | 155,062,000 |
Total, Fair Value | $ 195,742,000 | $ 23,309

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