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The following table summarizes the changes in investments in equity securities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the year ended December 31, 2021: (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Change in fair value of warrants | $ 542,000 | $ 49,000
Conversion of loans to equity securities | 4,250,000 |
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, 2021 | 262,000 |
Investment in convertible preferred stock | 14,950,000 |
Investment in warrants | 2,673,000 |
Change in fair value of warrants | 8,224,000 |
Conversion of loans to equity securities | 3,520,000 |
Unrealized gains on equity securities | 2,510,000 |
Conversion to marketable securities | (1,657,000) |
Balance at December 31, 2021 | $ 30,482,000 | $ 262,000

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