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Borrowings - NMNLC Credit Facilities (Details) - USD ($)
$ in Thousands
 11 Months Ended 12 Months Ended
Nov. 01, 2022
Dec. 06, 2021
Sep. 21, 2018
Oct. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 01, 2022
Apr. 30, 2022
Line of Credit Facility [Line Items]                      
Amortization of financing costs         $ 6,837 $ 7,388 $ 4,935        
Revolving Credit Facility | NMNLC Credit Facility | Credit Facility                      
Line of Credit Facility [Line Items]                      
Average debt outstanding         0 0 0 $ 1,471 $ 3,570    
Revolving Credit Facility | NMNLC Credit Facility II                      
Line of Credit Facility [Line Items]                      
Credit facility outstanding balance         3,785 15,200          
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                      
Line of Credit Facility [Line Items]                      
Interest expense         252 93          
Non-usage fee         3 3          
Amortization of financing costs         $ 58 $ 83          
Weighted average interest rate         3.50% 2.70%          
Effective interest rate         4.40% 5.10%          
Average debt outstanding         $ 7,195 $ 3,501 0 $ 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         $ 26,339            
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 | Credit Facility                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage on unused capacity     0.15%                
Interest expense             0        
Non-usage fee             33        
Amortization of financing costs             $ 11        
NMNLC | Revolving Credit Facility | NMNLC Credit Facility | Credit Facility | LIBOR                      
Line of Credit Facility [Line Items]                      
Interest rate margin     2.50%                
NMNLC | Revolving Credit Facility | NMNLC Credit Facility | Credit Facility | Prime Rate                      
Line of Credit Facility [Line Items]                      
Interest rate margin     1.50%                
NMNLC | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage on unused capacity   0.05%   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                      
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%