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Marketable Securities - Summary of Investments (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Marketable securities available-for-sale |  |
Amortization Cost | $ 180,675 | $ 121,103
Gross Unrealized Gains | 7 | 39
Gross Unrealized Losses | (9) | (2)
Estimated Fair Value | 180,673 | 121,140
Aggregate fair value of marketable securities with unrealized gains (losses) position for less than a year | $ 45,700 | $ 19,600
Number of investments in an unrealized loss position for less than a year | security | 5 | 3
U.S. Treasury obligations |  |
Marketable securities available-for-sale |  |
Amortization Cost | $ 180,675 | $ 121,103
Gross Unrealized Gains | 7 | 39
Gross Unrealized Losses | (9) | (2)
Estimated Fair Value | $ 180,673 | $ 121,140

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