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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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