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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Base management fee payable	$ 3,687		$ 3,687		$ 3,135
Base management fee waiver	76	$ 69	228	$ 98
Income incentive fee	3,047	2,425	5,283	7,644
Income Incentive fee payable	3,047		$ 3,047		2,622
Percentage of net capital gains			20.00%
Capital gains incentive fee payable	8,427		$ 8,427		6,136
Aggregate amount of capital gains incentive fees			$ 6,484
Percentage of capital gains incentive fee accrued			20.00%
Capital gains incentive fee accrued (reversed).	(258)	4,664	$ (593)	8,638
Accrued capital gains incentive fee payable	22,498		$ 22,498		29,227
Investment Advisory Agreement
Related Party Transaction [Line Items]
Management fees annual rate			1.75%
Base management fee	3,763	3,270	$ 10,724	9,661
Base management fee payable	3,687		3,687		3,135
Base management fee waiver	$ 76	69	$ 228	98
Pre-incentive fee fixed hurdle rate	2.00%		2.00%
Incentive fee			$ 0
Pre-incentive fee net investment income			100.00%
Payment percentage of preincentive fees net investment income			20.00%
Percentage of amount of pre-incentive fee net investment income			20.00%
Written notice period for termination of agreement			60 days
Investment Advisory Agreement | Maximum
Related Party Transaction [Line Items]
Pre-incentive fee fixed hurdle rate			2.50%
Administration Agreement
Related Party Transaction [Line Items]
Administrative service expenses	$ 480	$ 438	$ 1,412	$ 1,281
Accrued administrative service expense payable	$ 550		$ 550		$ 634
Limited Partnership Agreement | Fidus Equity Fund I, L.P. | Equity Investment
Related Party Transaction [Line Items]
Equity ownership percentage	50.00%		50.00%

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