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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and Cash Equivalents |  |
Fair Value |  |
Amortized Cost | $ 89,887 | $ 126,263
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 89,887 | 126,263
U.S. Treasury Securities |  |
Fair Value |  |
Amortized Cost | 15,182 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 15,183 |
Total Short-term Investments |  |
Fair Value |  |
Amortized Cost | 28,619 | 26,018
Gross Unrealized Gains | 6 | 5
Gross Unrealized Losses | (11) | (11)
Estimated Fair Value | 28,614 | 26,012
Total Cash and Cash Equivalents and Investments |  |
Fair Value |  |
Amortized Cost | 118,506 | 152,281
Gross Unrealized Gains | 6 | 5
Gross Unrealized Losses | (11) | (11)
Estimated Fair Value | 118,501 | 152,275
Corporate Debt Securities |  |
Fair Value |  |
Amortized Cost | 13,437 | 26,018
Gross Unrealized Gains | 5 | 5
Gross Unrealized Losses | (11) | (11)
Estimated Fair Value | $ 13,431 | $ 26,012

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