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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 three months ended March 31, 2022: (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Change in fair value of warrants $ 18,000 $ 679,000
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 30,482,000  
Investment in equity securities 3,820,000  
Change in fair value of warrants 10,281,000  
Unrealized gains on equity securities 3,180,000  
Conversion to marketable securities (10,672,000)  
Balance at March 31, 2022 $ 37,091,000