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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Portfolio
Segment
Dec. 31, 2024
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Accumulated deficit $ (226,780) $ (227,844)
Reserve balance for credit loss 100 100
Deferred revenue 600 $ 600
Nonaccrual loans 22,900  
Notes receivable, principal amount 29,300  
Borrower's note balance $ 22,100  
Borrower's note balance, percentage 75.00% 74.00%
Due from borrower $ 22,100  
Number of distinct portfolio purchases and loan agreements | Portfolio 11  
Equity method investments $ 21,691 $ 20,892
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 381  
Notes Receivable [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Notes Receivables 5,100  
Equity Method Investments [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Equity method investments $ 17,800  
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 1.3718%  
Note receivable outstanding $ 400  
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 3.80%  
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 1.3718%  
Credit loss rate 5.00%  
Allowance for credit loss $ 1,000