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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Information Related to Borrowings
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the Holdings Credit Facility for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 202320222021
Interest expense$41,176 $22,542 $10,210 
Non-usage fee$760 $743 $1,282 
Amortization of financing costs$1,912 $2,956 $2,852 
Weighted average interest rate7.0 %3.9 %2.1 %
Effective interest rate7.6 %4.5 %3.0 %
Average debt outstanding$577,759 $581,367 $478,016 
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the NMFC Credit Facility for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 202320222021
Interest expense$7,380 $4,608 $3,171 
Non-usage fee$363 $247 $213 
Amortization of financing costs$216 $229 $199 
Weighted average interest rate7.1 %3.5 %2.4 %
Effective interest rate7.7 %3.8 %2.7 %
Average debt outstanding$103,244 $133,053 $132,685 
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the DB Credit Facility for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 20232022 2021
Interest expense(1)$14,964 $9,816 $5,985 
Non-usage fee(1)$466 $355 $362 
Amortization of financing costs$1,113 $1,082 $981 
Weighted average interest rate7.9 %4.7 %2.9 %
Effective interest rate8.9 %5.4 %3.5 %
Average debt outstanding$186,422 $209,898 $209,307 
(1)Interest expense includes the portion of the facility agent fee applicable to the drawn portion of the DB Credit Facility and non-usage fee includes the portion of the facility agent fee applicable to the undrawn portion of the DB Credit Facility.
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the NMNLC Credit Facility II for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 202320222021
Interest expense$186 $252 $93 
Non-usage fee$1 $3 $3 
Amortization of financing costs$87 $58 $83 
Weighted average interest rate7.2 %3.5 %2.7 %
Effective interest rate11.0 %4.4 %5.1 %
Average debt outstanding$2,506 $7,195 $3,501 
The following table summarizes the interest expense and amortization of financing costs incurred on the Unsecured Notes for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 2023(1)2022(2)2021(3)
Interest expense$21,511 $25,033 $24,401 
Amortization of financing costs$770 $801 $1,864 
Weighted average interest rate4.9 %4.8 %4.7 %
Effective interest rate5.1 %4.9 %5.1 %
Average debt outstanding$438,473 $526,829 $516,611 
(1)For the year ended December 31, 2023, amounts reported include interest and amortization of financing costs related to the 8.250% Unsecured Notes for the period from November 13, 2023 (issuance date of the 8.250% Unsecured Notes ) to December 31, 2023.
(2)For the year ended December 31, 2022, amounts reported include interest and amortization of financing costs related to the 2022A Unsecured Notes for the period from June 15, 2022 (issuance date of the 2022A Unsecured Notes) to December 31, 2022.
(3)For the year ended December 31, 2021, amounts reported include interest and amortization of financing costs related to the 2021A Unsecured Notes for the period from January 29, 2021 (issuance date of the 2021A Unsecured Notes) to December 31, 2021.
The following table summarizes the Company’s SBA-guaranteed debentures as of December 31, 2023.
Issuance DateMaturity DateDebenture AmountInterest RateSBA Annual Charge
Fixed SBA-guaranteed debentures(1):    
March 25, 2015March 1, 2025$37,500 2.517 %0.355 %
September 23, 2015September 1, 202537,500 2.829 %0.355 %
September 23, 2015September 1, 202528,795 2.829 %0.742 %
March 23, 2016March 1, 202613,950 2.507 %0.742 %
September 21, 2016September 1, 20264,000 2.051 %0.742 %
September 20, 2017September 1, 202713,000 2.518 %0.742 %
March 21, 2018March 1, 202815,255 3.187 %0.742 %
Fixed SBA-guaranteed debentures(2):
September 19, 2018September 1, 202815,000 3.548 %0.222 %
September 25, 2019September 1, 202919,000 2.283 %0.222 %
March 25, 2020March 1, 203041,000 2.078 %0.222 %
March 25, 2020March 1, 203024,000 2.078 %0.275 %
September 23, 2020September 1, 203051,000 1.034 %0.275 %
Total SBA-guaranteed debentures $300,000   
(1)SBA-guaranteed debentures are held by SBIC I.
(2)SBA-guaranteed debentures are held by SBIC II.
The following table summarizes the interest expense and amortization of financing costs incurred on the SBA-guaranteed debentures for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 202320222021
Interest expense$8,104 $8,104 $8,104 
Amortization of financing costs$1,002 $1,002 $1,002 
Weighted average interest rate2.7 %2.7 %2.7 %
Effective interest rate3.0 %3.0 %3.0 %
Average debt outstanding$300,000 $300,000 $300,000 
Schedule of Information Related to Convertible Notes
The following table summarizes certain key terms related to the convertible features of the Company’s 2022 Convertible Notes as of December 31, 2023.
 2022 Convertible Notes
Initial conversion premium14.7 %
Initial conversion rate(1)70.4225 
Initial conversion price$14.20 
Conversion rate at December 31, 2023(1)(2)72.1779 
Conversion price at December 31, 2023(2)(3)$13.85 
Last conversion price calculation dateDecember 22, 2023
(1)Conversion rates denominated in shares of common stock per $1 principal amount of the 2022 Convertible Notes converted.
(2)Represents conversion rate and conversion price, as applicable, taking into account certain de minimis adjustments that will be made on the conversion date.
(3)The conversion price in effect at December 31, 2023 on the 2022 Convertible Notes was last calculated on December 22, 2023.
The following table summarizes the interest expense, amortization of financing costs and amortization of premium incurred on the 2018 Convertible Notes and 2022 Convertible Notes (together, the "Convertible Notes") for the years ended December 31, 2023, December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 20232022(1)2021
Interest expense$22,767 $13,734 $11,572 
Amortization of financing costs$1,676 $694 $395 
Amortization of premium$(130)$(130)$(103)
Weighted average interest rate7.1 %6.0 %5.8 %
Effective interest rate7.6 %6.2 %5.9 %
Average debt outstanding$320,494 $228,806 $201,250 
(1)For the year ended December 31, 2022, amounts reported include interest and amortization of financing costs related to the 2022 Convertible Notes for the period from November 2, 2022 (issuance of the 2022 Convertible Notes) to December 31, 2022.