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Borrowings - NMNLC Credit Facility II (Details) - USD ($)
$ in Thousands
 3 Months Ended 11 Months Ended
Nov. 01, 2022
Mar. 31, 2023
Mar. 31, 2022
Oct. 31, 2022
Dec. 31, 2022
May 01, 2022
Apr. 30, 2022
Line of Credit Facility [Line Items]              
Amortization of financing costs   $ 1,637 $ 1,692        
NMNLC Credit Facility II              
Line of Credit Facility [Line Items]              
Credit facility outstanding balance   3,120     $ 3,785    
Revolving Credit Facility | NMNLC Credit Facility II              
Line of Credit Facility [Line Items]              
Credit facility outstanding balance   3,120          
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility              
Line of Credit Facility [Line Items]              
Interest expense   53 118        
Non-usage fee   0 1        
Amortization of financing costs   $ 23 $ 27        
Weighted average interest rate   7.20% 3.10%        
Effective interest rate   10.40% 3.90%        
Average debt outstanding   $ 2,973 $ 15,200        
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   $ 25,675          
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%