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Organization - Additional Information (Details) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Aug. 23, 2021 $ / shares shares | Jun. 09, 2021 USD ($) $ / shares shares | Oct. 28, 2020 USD ($) $ / shares shares | Dec. 31, 2018 | Dec. 14, 2018 USD ($) $ / shares | Nov. 08, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2022 $ / shares shares | Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Aug. 24, 2021 shares | Jul. 23, 2021 USD ($) | Jun. 24, 2021 USD ($) | Mar. 29, 2019 | Mar. 28, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company incorporated date |  |  |  |  |  |  |  |  | Aug. 08, 2006 |  |  |  |  |  |  |  |  |
Asset coverage requirement percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150.00% | 200.00%
Net investment income per common share | $ / shares | [1],[2] |  |  |  |  |  |  |  | $ 3.00 | $ 4.92 | $ 3.40 | $ 0.82 | $ 2.70 |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |
Common stock, issued | shares |  |  |  |  |  |  |  |  | 9,916,856 | 9,867,998 |  |  |  |  |  |  |  |
Reverse stock split |  |  |  |  |  |  |  |  | 0.10 |  |  |  |  |  |  |  |  |
Common stock, authorized | shares |  |  |  |  |  |  |  |  | 20,000,000 | 20,000,000 |  |  |  | 20,000,000 |  |  |  |
Externalization Agreement | BC Partners Advisors L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock per share | $ / shares |  |  |  |  |  | $ 0.669672 |  |  |  |  |  |  |  |  |  |  |  |
Payment for Incentive Fee | $ |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Incentive fees period |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Net investment income per common share | $ / shares |  |  |  |  |  | $ 0.40 |  |  |  |  |  |  |  |  |  |  |  |
KCAP Freedom 3 LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution to purchase assets | $ |  |  |  |  |  |  |  | $ 37,000,000 |  |  |  |  |  |  |  |  |  |
KCAP Freedom 3 LLC | Freedom 3 Opportunities LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution to purchase assets | $ |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |
KCAP Senior Funding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Loans | $ |  |  |  |  |  |  |  | 184,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of debt | $ |  |  |  |  |  |  |  | $ 147,000,000 |  |  |  |  |  |  |  |  |  |
Reverse Stock Split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized | shares |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HCAP Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  | $ 28,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, due date |  |  | Sep. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument redemption, amount | $ |  |  | $ 28,750,000 |  |  |  |  |  |  |  |  |  |  |  | $ 28,750,000 | $ 28,750,000 |  |
Asset Manager Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  |  |  |  | Nov. 08, 2018 |  |  |  |  |  |  |  |  |  |  |
Date of acquisition closing |  |  |  |  | Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ |  |  |  |  |  |  | $ 37,900,000 |  |  |  |  |  |  |  |  |  |  |
GARS Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  | Jun. 24, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  | $ 1.26 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share value in cash | $ / shares |  |  |  | $ 1.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued | shares |  |  |  | 1.917 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration funded by adviser | $ / shares |  |  |  | $ 0.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration funded by adviser | $ |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, number of shares issued | shares |  |  |  | 1.917 |  |  |  |  |  |  |  |  |  |  |  |  |  |
GARS Acquisition | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued | shares |  |  |  | 30,765,640 |  |  |  |  |  |  |  |  |  |  |  |  |  |
HCAP Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ |  |  | $ 18,537,512.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  | $ 2.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration funded by adviser | $ |  |  | $ 2,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, number of shares issued | shares |  |  | 15,252,453 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of electing shares converted to non-electing shares | shares |  |  | 475,806 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received for each electing shares | $ |  |  | $ 7,430 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received for each electing shares | $ / shares |  |  | $ 0.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received for each non-electing shares | $ / shares |  |  | 3.86 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HCAP Acquisition | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued | shares |  |  | 15,252,453 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Based on weighted average number of common shares outstanding for the period.
[2] | Totals may not sum due to rounding.

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