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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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