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Marketable Equity Securities (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Marketable Equity Securities |  |  |  |
Cost of marketable equity securities sold | $ 0 | $ 105 | $ 0 | $ 212
Realized (loss) gain on marketable equity securities sold | 0 | (78) | 0 | (159)
Proceeds from the sale of marketable equity securities sold | 0 | (27) | 0 | (53)
Net (loss) gain on marketable equity securities | (227) | (446) | (102) | (314)
Change in marketable equity securities at fair value | $ (227) | $ (473) | $ (102) | $ (367)

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