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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Debt Securities, Available-for-Sale, Current | $ 40,518 |
Cash and Cash Equivalents |  |
Fair Value |  |
Gross Unrealized Gains |  | $ 0
Gross Unrealized Losses |  | (1)
Estimated Fair Value |  | 64,065
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 21,450 | 64,066
Debt Securities, Available-for-Sale, Current | 21,450 |
U.S. Treasury Securities |  |
Fair Value |  |
Estimated Fair Value |  | 7,561
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 89 | 1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Amortized Cost, Current | 30,419 | 7,562
Debt Securities, Available-for-Sale, Current | 30,330 |
Total Short-term Investments |  |
Fair Value |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 150 | 9
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Amortized Cost, Current | 40,668 | 22,687
Debt Securities, Available-for-Sale, Current | 40,518 | 22,678
Total Cash and Cash Equivalents and Investments |  |
Fair Value |  |
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (10)
Estimated Fair Value |  | 86,743
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 150 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 62,118 | 86,753
Debt Securities, Available-for-Sale, Current | 61,968 |
Corporate Debt Securities |  |
Fair Value |  |
Estimated Fair Value |  | 15,117
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 61 | 8
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Amortized Cost, Current | 10,249 | $ 15,125
Debt Securities, Available-for-Sale, Current | $ 10,188 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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