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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Cash and Cash Equivalents |  |  |
Fair Value |  |  |
Amortized Cost | $ 52,251 | $ 36,112 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 52,251 | 36,112 |
U.S. Treasury Securities |  |  |
Fair Value |  |  |
Amortized Cost | 38,796 | 235,463 |
Gross Unrealized Gains | 40 | 94 |
Gross Unrealized Losses | 0 | (10) |
Estimated Fair Value | 38,836 | 235,547 |
Total Short-term Investments |  |  |
Fair Value |  |  |
Amortized Cost | 59,160 | 235,463 |
Gross Unrealized Gains | 41 | 94 |
Gross Unrealized Losses | (6) | (10) |
Estimated Fair Value | 59,195 | 235,547 |
Total Cash and Cash Equivalents and Investments |  |  |
Fair Value |  |  |
Amortized Cost | 111,411 | 271,575 |
Gross Unrealized Gains | 41 | 94 |
Gross Unrealized Losses | (6) | (10) |
Estimated Fair Value | 111,446 | $ 271,659 |
Corporate Debt Securities |  |  |
Fair Value |  |  |
Amortized Cost | 20,364 |  |
Gross Unrealized Gains |  |  | $ 1
Gross Unrealized Losses | 6 |  |
Estimated Fair Value | $ 20,359 |  |

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