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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ 2,148 | $ 2,043 | $ 4,296 | $ 5,210
Base management fee | Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 2,148 | 2,043 | 4,296 | 4,079
Incentive fee | Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | 0 | 0 | 1,131
Administration Fee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 514 | 463 | 1,090 | 926
Financing Fees and Selling Commissions and Dealer Management Fees | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 183 | 2,891 | 332 | 6,163
Selling Commissions and Dealer Management Fees | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 183 | 2,891 | 332 | 6,069
Financing fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 |  | $ 0 |
Financing fees | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ 0 | $ 0 |  | $ 94

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