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Marketable Securities - Summary of Investments (Details) $ in Thousands | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Marketable securities available-for-sale |  |
Amortization Cost | $ 40,194 | $ 180,675
Gross Unrealized Gains |  | 7
Gross Unrealized Losses | (35) | (9)
Estimated Fair Value | 40,159 | 180,673
Aggregate fair value of marketable securities with unrealized gains (losses) position for less than a year | $ 30,200 | $ 45,700
Number of investments in an unrealized loss position for less than a year | security | 3 | 5
U.S. Treasury obligations |  |
Marketable securities available-for-sale |  |
Amortization Cost | $ 40,194 | $ 180,675
Gross Unrealized Gains |  | 7
Gross Unrealized Losses | (35) | (9)
Estimated Fair Value | $ 40,159 | $ 180,673

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