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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure	$ 320,186	$ 68,264
Mutual funds
Assets, Fair Value Disclosure	110,060	33,135
U.S. Treasury notes
Assets, Fair Value Disclosure		23,309
Corporate debt securities
Assets, Fair Value Disclosure	42,365
U.S. Treasury notes and bills
Assets, Fair Value Disclosure	153,377
Money market mutual fund
Assets, Fair Value Disclosure	14,384	11,820
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure	320,186	68,264
Fair Value, Inputs, Level 1 [Member] | Mutual funds
Assets, Fair Value Disclosure	110,060	33,135
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure		23,309
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	42,365
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury notes and bills
Assets, Fair Value Disclosure	153,377
Fair Value, Inputs, Level 1 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	14,384	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
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury notes and bills
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
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury notes and bills
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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