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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Investments In And Advances To Affiliates [Line Items]
Net Realized Gains (Losses)	$ 63	$ 3,138
Controlled, Affiliated Investments
Investments In And Advances To Affiliates [Line Items]
Fair Value	280,396		$ 271,005
Gross Additions			13,455
Net Change in Unrealized Appreciation (Depreciation)			(4,064)
Interest Income	6,909
Dividend/Other Income	2,975
Controlled, Affiliated Investments \| Marketplace Events, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value	32,732		31,390
Gross Additions			330
Net Change in Unrealized Appreciation (Depreciation)			1,012
Interest Income	950
Controlled, Affiliated Investments \| Loan Fund I LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value	247,664		239,615
Gross Additions			13,125
Net Change in Unrealized Appreciation (Depreciation)			$ (5,076)
Interest Income	5,959
Dividend/Other Income	$ 2,975