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Borrowings - NMNLC Credit Facility II (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 11 Months Ended
Nov. 01, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Oct. 31, 2022
Dec. 31, 2022
May 01, 2022
Apr. 30, 2022
Line of Credit Facility [Line Items]                  
Amortization of financing costs       $ 5,002 $ 5,082        
NMNLC Credit Facility II                  
Line of Credit Facility [Line Items]                  
Credit facility outstanding balance   $ 2,858   2,858     $ 3,785    
Revolving Credit Facility | NMNLC Credit Facility II                  
Line of Credit Facility [Line Items]                  
Credit facility outstanding balance   2,858   2,858     $ 3,785    
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                  
Line of Credit Facility [Line Items]                  
Interest expense   40 $ 25 136 225        
Non-usage fee   0 1 1 2        
Amortization of financing costs   $ 21 $ 5 $ 66 $ 40        
Weighted average interest rate   7.50% 5.00% 7.10% 3.40%        
Effective interest rate   11.70% 6.10% 10.90% 4.00%        
Average debt outstanding   $ 2,091 $ 2,013 $ 2,480 $ 8,939        
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC And NM CLFX LP                  
Line of Credit Facility [Line Items]                  
Maximum amount of borrowings available $ 27,500                
Credit facility outstanding balance   $ 25,413   $ 25,413          
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage on unused capacity           0.05%      
Maximum amount of borrowings available               $ 10,000 $ 20,000
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | NMNLC And NM CLFX LP                  
Line of Credit Facility [Line Items]                  
Interest rate margin 2.25%                
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | NMNLC                  
Line of Credit Facility [Line Items]                  
Interest rate margin           2.75%      
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | Minimum | NMNLC                  
Line of Credit Facility [Line Items]                  
Interest rate margin           0.35%