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Investments In Securities and Fair Value (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |
Impaired amount for measurement alternative investments | $ 0 | $ 0

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- Definition Loss recognized as a result of the initial and subsequent write-down of a long-lived asset's carrying amount to fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- References No definition available. + Details
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