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Borrowings - NMNLC Credit Facilities (Details) - USD ($)
$ in Thousands
 11 Months Ended 12 Months Ended
Nov. 01, 2022
Dec. 06, 2021
Oct. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 01, 2022
Apr. 30, 2022
Line of Credit Facility [Line Items]                    
Amortization of financing costs       $ 6,780 $ 6,837 $ 7,388        
NMNLC Credit Facility II                    
Line of Credit Facility [Line Items]                    
Credit facility outstanding balance       2,853 3,785          
Revolving Credit Facility | NMNLC Credit Facility II                    
Line of Credit Facility [Line Items]                    
Credit facility outstanding balance       2,853 3,785 15,200        
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                    
Line of Credit Facility [Line Items]                    
Interest expense       186 252 93        
Non-usage fee       1 3 3        
Amortization of financing costs       $ 87 $ 58 $ 83        
Weighted average interest rate       7.20% 3.50% 2.70%        
Effective interest rate       11.00% 4.40% 5.10%        
Average debt outstanding       $ 2,506 $ 7,195 $ 3,501 $ 0 $ 0    
NMNLC and NM CLFX LP | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum amount of borrowings available $ 27,500                  
Credit facility outstanding balance       $ 25,408            
NMNLC and NM CLFX LP | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR                    
Line of Credit Facility [Line Items]                    
Interest rate margin 2.25%                  
NMNLC | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                    
Line of Credit Facility [Line Items]                    
Commitment fee percentage on unused capacity     0.05%              
Maximum amount of borrowings available                 $ 10,000 $ 20,000
NMNLC | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | LIBOR                    
Line of Credit Facility [Line Items]                    
Interest rate margin   2.75%                
NMNLC | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | Minimum                    
Line of Credit Facility [Line Items]                    
Interest rate margin     0.35%