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The following table summarizes the changes in investments in debt and 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, 2021: (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Change in fair value of warrants $ (259,000)   $ 130,000 $ 6,000
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 $ 9,924,000   $ 262,000 $ 262,000  
Investment in convertible promissory notes     3,850,000    
Investment in convertible preferred stock     2,850,000    
Initial valuation of acquired warrants     2,673,000    
Change in fair value of warrants     995,000    
Conversion to marketable securities     (2,656,000)    
Balance at September 30, 2021     $ 9,924,000