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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Segment
Portfolio
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Nov. 30, 2023
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Allowance for doubtful accounts as of December 31, 2022 $ 130   $ 132  
Accumulated deficit (227,641)   (233,026)  
Reserve balance for credit loss 100   100  
Deferred revenue 500   500  
Nonaccrual loans 24,000   $ 0  
Notes receivable, principal amount 32,000      
Borrower's note balance $ 22,500      
Borrower's note balance, percentage 70.00%   62.00%  
Due from borrower $ 22,500      
Number of distinct portfolio purchases and loan agreements | Portfolio 11      
Amortization Cost       $ 51,600
Percentage of Amortization Cost       59.00%
Weighted average of years to the life of the Restructured Loans       1.50%
Allowances for Credit Losses $ 1,100 $ 1,000    
Notes Receivables 300      
Equity method investments 21,447   $ 21,361  
Other loans placed in nonaccrual status 1,500      
Beginning balance of reserve for credit losses as of January 1, 2023 100   100  
Allowance for credit loss (422)      
HGC Ltd.[Member]        
Summary Of Significant Accounting Policies [Line Items]        
Amortization Cost       $ 22,200
Percentage of Amortization Cost       57.00%
Equity method investments 800      
Notes Receivable [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Notes Receivables 5,400      
Equity Method Investments [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Equity method investments $ 18,600      
Consolidated [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Number of reporting segment | Segment 3      
Accounting Standards Update 2022-02 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of service revenue that is recognized over a period of time against total revenue 1.3834%      
Note receivable outstanding $ 400   700  
Accounting Standards Update 2022-02 [Member] | Notes Receivable [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of service revenue that is recognized over a period of time against total revenue 3.60%      
Accounting Standards Update 2022-02 [Member] | Equity Method Investments [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of service revenue that is recognized over a period of time against total revenue 1.3834%      
Credit loss rate 4.80%      
Allowance for credit loss $ 1,000   $ 900