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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 37,797 | $ 31,999
Fair Value | 40,904 | 39,990
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 27,323 | 22,378
Fair Value | 26,598 | 25,909
Equity securities |  |
Investment Securities - fair value |  |
Cost | 10,467 | 9,614
Fair Value | 14,303 | 14,078
Debt securities |  |
Investment Securities - fair value |  |
Cost | 7 | 7
Fair Value | $ 3 | $ 3

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- Definition Amount 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 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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