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RELATED-PARTY TRANSACTIONS - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Base management fee |  | $ 1,748 | $ 1,078 |  | $ 4,494 | $ 3,159 |
Incentive fee |  | 945 | 821 |  | 2,107 | 2,155 |
Total fees to our Adviser, net |  | 2,693 | 1,899 |  | 6,601 | 5,314 |
Administration fee |  | 412 | 344 |  | 1,115 | 1,084 |
Selling commissions and dealer-manager fees |  | 1,213 | 598 |  | 3,165 | 3,368 |
Financing fees |  | 12 | 7 |  | 64 | 30 |
Total fees to Gladstone Securities |  | $ 1,225 | $ 605 |  | $ 3,229 | $ 3,398 |
Series B Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Dividend rate | 6.00% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.001 |  |  |  |  |  |
Series B Preferred Stock | Gladstone Securities | Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Selling commissions and dealer-manager fees |  |  |  | $ 2,500 |  |  |

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- Definition Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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