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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 + Details
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