Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2012 D	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) item
Summary of Significant Accounting Policies
Dividend reinvestment plan minimum time requirement to opt out dividend payment | D	3
Unamortized deferred financing costs		$ 3,566		$ 3,566		$ 4,486
Amortization of deferred financing costs		330	$ 522	977	$ 1,613
Deferred offering costs		262		$ 262		$ 184
Number of investments held in portfolio company that was denominated in Australian dollars | item						1
Number of investments with foreign denomination | item				0
Excise tax accrued (in percent)				4.00%
Net expense (benefit) for U.S. federal excise tax		95	55	$ 345	64
Payables for excise taxes		106		106		$ 1
U.S. federal and state corporate-level income taxes, Net tax expense		$ 0	$ 923	$ 150	$ 1,225