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The following table summarizes the changes in investments in other equity securities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the nine months ended September 30, 2022: (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in fair value of financial instruments | $ 3,000 | $ (259,000) | $ 27,000 | $ 130,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Balance at January 1, 2022 |  |  | 9,215,000 |
Investment in preferred stock |  |  | 6,495,000 |
Change in fair value of financial instruments |  |  | 25,850,000 |
Conversion to marketable securities |  |  | (37,644,000) |
Balance at September 30, 2022 | $ 3,916,000 |  | $ 3,916,000 |

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