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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Base management fee payable	$ 3,769	$ 3,769	$ 3,135
Income incentive fee		8,318	10,266	$ 8,952
Income incentive fee waiver		0	0	423
Income Incentive fee payable	3,035	$ 3,035	2,622
Percentage of net capital gains		20.00%
Capital gains incentive fee payable	7,556	$ 7,556	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).		$ (432)	18,196	(1,684)
Accrued capital gains incentive fee payable	22,659	$ 22,659	29,227
Investment Advisory Agreement
Related Party Transaction [Line Items]
Management fees annual rate		1.75%
Base management fee		$ 14,568	12,874	12,932
Base management fee payable	$ 3,769	3,769	3,135
Base management fee waiver		$ 302	176	0
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		$ 1,902	1,719	$ 1,720
Accrued administrative service expense payable	$ 700	$ 700	$ 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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