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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Loan
Equipment
Dec. 31, 2023
USD ($)
Loan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Disclosure Of Summary Of Significant Accounting Policies [Line Items]          
Fair value of companies investment percentage 99.10%        
Market index of investment securities $ 0        
Maturity period description original maturity of three months or less        
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 9,627,000 $ 4,761,000 $ 10,612,000 $ 46,742,000  
Cash and cash equivalents 9,627,000 4,761,000 10,612,000    
Restricted cash $ 0 0      
Escrow Distribution period 1 year        
Escrow receivables balance $ 0 2,400,000      
Interest income 9,100,000 8,000,000 300,000    
Dividend income $ 1,600,000 $ 600,000 $ 0    
Debt security payment due 90 days        
Number of portfolio companies loans | Loan 3 3      
Number of portfolio companies equipment financing | Equipment 2        
Non accrual cost $ 43,300,000 $ 60,800,000      
Fair value $ 12,700,000 $ 43,200,000      
Fair value of debt investment portfolio 0.80% 3.50%      
Debt instrument percentage 6.00%        
Investment percentage 16.70% 17.50% 15.70% 10.50% 10.50%
Percentage of net tax- exempt income 90.00%        
Uncertain tax position $ 0 $ 0      
Nondeductible federal excise tax 4.00%        
Ordinary income percentage 98.00%        
Capital gain net income percentage 98.20%        
Excise tax 4.00%        
Goldman Sachs Financial Square Government Institutional Fund          
Disclosure Of Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents $ 3,800,000 $ 3,100,000      
Minimum          
Disclosure Of Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents interest rate 3.00%        
Investment percentage 90.00%        
Maximum          
Disclosure Of Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents interest rate 6.00%