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Borrowings - NMNLC Credit Facility II (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 01, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Line of Credit Facility [Line Items]            
Amortization of financing costs       $ 7,502 $ 5,002  
NMNLC Credit Facility II            
Line of Credit Facility [Line Items]            
Credit facility outstanding balance   $ 2,908   2,908   $ 2,853
Revolving Credit Facility | NMNLC Credit Facility II            
Line of Credit Facility [Line Items]            
Credit facility outstanding balance   2,908   $ 2,908   $ 2,853
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility            
Line of Credit Facility [Line Items]            
Debt instrument, variable interest rate, type [Extensible Enumeration]       SOFR    
Interest expense   41 $ 40 $ 135 136  
Non-usage fee   0 0 1 1  
Amortization of financing costs   $ 21 $ 21 $ 64 $ 66  
Weighted average interest rate   7.60% 7.50% 7.60% 7.10%  
Effective interest rate   11.70% 11.70% 11.40% 10.90%  
Average debt outstanding   $ 2,151 $ 2,091 $ 2,341 $ 2,480  
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC And NM CLFX LP            
Line of Credit Facility [Line Items]            
Interest rate margin 2.25%          
Maximum amount of borrowings available $ 27,500          
Credit facility outstanding balance   $ 25,463   $ 25,463    
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC            
Line of Credit Facility [Line Items]            
Commitment fee percentage on unused capacity 0.05%          
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | Minimum | NMNLC            
Line of Credit Facility [Line Items]            
Interest rate margin 0.35%