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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

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