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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Aug. 23, 2021
May 11, 2021
Feb. 10, 2020
Dec. 31, 2021
Dec. 31, 2020
Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Line of credit $ 2,000,000.0        
Debt instrument, Maturity date Aug. 23, 2025        
Interest rate per annum 3.00%        
Litigation settlement installments amount due $ 44,000        
Debt Outstanding Amount       $ 1,900,000  
Wall Street Journal prime rate [Member] | Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Interest rate per annum   1.70%      
Wall Street Journal prime rate [Member] | Minimum [Member] | Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Interest rate per annum   4.95%      
Revolving Line of Credit [Member] | Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Convert From Revolving Debt To Term Debt       5,000,000.0  
First Choice Bank [Member] | Revolving Line of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit         $ 0
Line of credit, repayment         5,600,000
Line of credit, drawn amount         $ 5,600,000
First Choice Bank [Member] | Revolving Line of Credit [Member] | Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Line of credit       1,900,000  
Line of credit, repayment       1,300,000  
Line of credit, drawn amount       $ 3,200,000  
C3bank [Member]          
Debt Instrument [Line Items]          
Line of credit     $ 5,000,000.0    
Debt instrument, Maturity date     Apr. 05, 2021    
C3bank [Member] | Heritage Global LLC [Member]          
Debt Instrument [Line Items]          
Line of credit   $ 10,000,000.0      
Debt instrument, Maturity date   May 11, 2023      
C3bank [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate per annum     5.50%