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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 six months ended June 30, 2022: (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
 Change in fair value of warrants $ 6,000 $ (290,000) $ 24,000 $ 388,000
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     2,550,000  
 Change in fair value of warrants     13,867,000  
 Conversion to marketable securities     (24,828,000)  
 Balance at June 30, 2022 $ 804,000   $ 804,000