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Fair Value Measurements (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020
Fair Value Measurements |  |
Realized gain on corporate equity securities | $ 16,400 | $ 16,366

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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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Balance Type: | credit
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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration