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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 six months ended June 30, 2021: (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Change in fair value of warrants $ (290,000) $ 10,000 $ 388,000 $ 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     262,000  
Investment in convertible promissory notes     1,136,000  
Investment in convertible preferred stock     600,000  
Investment in warrants     2,467,000  
Change in fair value of warrants     1,224,000  
Accretion of discount     980,000  
Conversion to marketable securities     (2,656,000)  
Balance at June 30, 2021 $ 4,013,000   $ 4,013,000