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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and Cash Equivalents |  |
Fair Value |  |
Amortized Cost | $ 92,118 | $ 126,263
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 92,118 | 126,263
U.S. Treasury Securities |  |
Fair Value |  |
Amortized Cost | 15,123 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 15,124 |
Total Short-term Investments |  |
Fair Value |  |
Amortized Cost | 28,806 | 26,018
Gross Unrealized Gains | 1 | 5
Gross Unrealized Losses | (7) | (11)
Estimated Fair Value | 28,800 | 26,012
Total Cash and Cash Equivalents and Investments |  |
Fair Value |  |
Amortized Cost | 120,924 | 152,281
Gross Unrealized Gains | 1 | 5
Gross Unrealized Losses | (7) | (11)
Estimated Fair Value | 120,918 | 152,275
Corporate Debt Securities |  |
Fair Value |  |
Amortized Cost | 13,683 | 26,018
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (7) | (11)
Estimated Fair Value | $ 13,676 | $ 26,012

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