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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurements |  |
Fair Value Measurements | $ 500,657 | $ 601,011
Mutual funds |  |
Fair Value Measurements |  |
Fair Value Measurements | 98,747 | 110,006
U.S. Treasury notes |  |
Fair Value Measurements |  |
Fair Value Measurements | 201,390 | 223,896
Corporate debt securities |  |
Fair Value Measurements |  |
Fair Value Measurements | 198,664 | 155,796
Money market mutual fund |  |
Fair Value Measurements |  |
Fair Value Measurements | 1,856 | 111,313
Level 1 |  |
Fair Value Measurements |  |
Fair Value Measurements | 500,657 | 601,011
Level 1 | Mutual funds |  |
Fair Value Measurements |  |
Fair Value Measurements | 98,747 | 110,006
Level 1 | U.S. Treasury notes |  |
Fair Value Measurements |  |
Fair Value Measurements | 201,390 | 223,896
Level 1 | Corporate debt securities |  |
Fair Value Measurements |  |
Fair Value Measurements | 198,664 | 155,796
Level 1 | Money market mutual fund |  |
Fair Value Measurements |  |
Fair Value Measurements | $ 1,856 | $ 111,313

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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