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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure	$ 601,011	$ 68,264
Mutual funds
Assets, Fair Value Disclosure	110,006	33,135
U.S. Treasury notes
Assets, Fair Value Disclosure	223,896	23,309
Corporate debt securities
Assets, Fair Value Disclosure	155,796
Money market mutual fund
Assets, Fair Value Disclosure	111,313	11,820
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure	601,011	68,264
Fair Value, Inputs, Level 1 [Member] | Mutual funds
Assets, Fair Value Disclosure	110,006	33,135
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	223,896	23,309
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	155,796
Fair Value, Inputs, Level 1 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	111,313	11,820
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual funds
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Mutual funds
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	$ 0	$ 0

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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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