v3.24.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Oct. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Loan
shares
Dec. 31, 2021
USD ($)
Loan
shares
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Investment cost     $ 1,106,849,000 $ 1,150,602,000    
Investment owned, fair value     $ 1,067,009,000 $ 1,126,309,000    
PIK Income as a % of net investment income     12.20% 8.00% 4.20%  
Payment of excise tax percentage     4.00%      
Percentage of minimum beneficial ownership of voting securities for control     25.00%      
Percentage of minimum board representation for control     50.00%      
Percentage of beneficial ownership of voting securities for affiliation     5.00%      
Potentially dilutive securities outstanding | shares     0 0 0  
Other comprehensive income     $ 0 $ 0 $ 0  
Mojix Inc            
Summary Of Significant Accounting Policies [Line Items]            
Number of loans | Loan         6  
Cash Equivalents            
Summary Of Significant Accounting Policies [Line Items]            
Investments in money market funds     0 5,600,000    
Second Private Offering            
Summary Of Significant Accounting Policies [Line Items]            
Offering cost excluding placement agent fees           $ 600,000
Placement agent fees           200,000
Offering cost           700,000
IPO            
Summary Of Significant Accounting Policies [Line Items]            
Offering cost   $ 7,000,000        
Maximum | Second Private Offering            
Summary Of Significant Accounting Policies [Line Items]            
Offering cost           $ 600,000
Maximum | Initial Private Offering            
Summary Of Significant Accounting Policies [Line Items]            
Adjustment to additional paid in capital stock issued issuance costs $ 1,000,000          
Minimum | Initial Private Offering | Runway Growth Holdings LLC            
Summary Of Significant Accounting Policies [Line Items]            
Adjustment to additional paid in capital stock issued issuance costs $ 1,000,000          
Pivot3, Inc.            
Summary Of Significant Accounting Policies [Line Items]            
Write off accrued interest     0 $ 0    
Number of loans | Loan       1 1  
Aggregate principal funded on non-accrual status       $ 19,200,000 $ 30,300,000  
Fair value on non-accrual status       $ 9,300,000 $ 28,300,000  
Percentage of investment portfolio on non-accrual status       0.80% 3.90%  
Cumulative interest on investments       $ 3,900,000 $ 4,800,000  
Pivot3, Inc. | Senior Secured Term Loan            
Summary Of Significant Accounting Policies [Line Items]            
Investment cost     18,000,000      
Investment owned, fair value     950,000      
Realized loss     $ 17,000,000      
Pivot3, Inc. | Cash Interest Income            
Summary Of Significant Accounting Policies [Line Items]            
Cumulative interest on investments       3,600,000 4,100,000  
Pivot3, Inc. | OID Accretion Interest Income            
Summary Of Significant Accounting Policies [Line Items]            
Cumulative interest on investments       $ 300,000 $ 700,000