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Fair Value of Financial Assets and Liabilities (Details) - Schedule of fair value assets and liabilities - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets    
Equities $ 60,589 $ 24,274
Mutual fund securities 16,896 527
Unit Investments Trust 481  
Special purpose acquisition corps 2,559  
Total marketable securities 80,525 24,801
Short-term investment 6,274
Convertible note receivable 2,107  
Marketable securities:    
Investments   2,764
Quoted prices in active markets (Level 1) [Member]    
Assets    
Equities 60,589 24,274
Mutual fund securities 16,896 527
Unit Investments Trust 481  
Special purpose acquisition corps 2,559  
Total marketable securities 80,525 24,801
Short-term investment 6,274  
Convertible note receivable  
Marketable securities:    
Investments   2,764
Significant other observable inputs (Level 2) [Member]    
Assets    
Equities
Mutual fund securities
Unit Investments Trust  
Total marketable securities  
Short-term investment  
Convertible note receivable  
Marketable securities:    
Investments  
Significant unobservable inputs (Level 3) [Member]    
Assets    
Equities
Mutual fund securities
Unit Investments Trust  
Total marketable securities  
Short-term investment  
Convertible note receivable $ 2,107  
Marketable securities:    
Investments