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Borrowings - Additional Information (Details) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Jun. 23, 2021 USD ($) | Jun. 09, 2021 USD ($) | Apr. 30, 2021 USD ($) | Dec. 18, 2019 USD ($) | Jul. 18, 2019 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) CoverageTest | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Apr. 29, 2022 | Apr. 28, 2022 | Mar. 31, 2022 USD ($) | Jul. 23, 2021 USD ($) | Jun. 24, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 28, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average stated interest rate on debt outstanding |  |  |  |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |  |  | 3.20% |  |  |  |  |  |  |  |  |  |
Weighted average maturity on debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 2 months 12 days |  |  |  | 5 years 4 months 24 days |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | [2] |  |  |  |  |  |  |  |  |  | $ 364,934,000 | [1] |  |  |  |  |  |  |  |  | $ 352,434,000 | [3] |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  | $ 95,908,000 |  |  |  |  |  | $ 95,908,000 |  |  |  | $ 79,839,000 |  |  |  |  |  |  |  |  |  |
CLO par value |  |  |  |  |  |  | 95,908,000 |  |  |  |  |  | 95,908,000 |  |  |  | 79,839,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 363,802,000 |  |  |  |  |  | 363,802,000 |  |  |  | 347,191,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  | $ (1,835,000) | [4] |  |  |  |  |  |  |  |  |  |  |
GLPRF LLC | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% | 2.85% |  |  |  |  |  |  |
CLO Facility | GARS Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 420,000,000.0 |
Discount amortized over the remaining term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | 97,071,000 |  |  |  | 93,071,000 |  | 97,071,000 |  |  |  | 80,571,000 |  |  |  | 80,571,000 |  |  |  | $ 49,321,000 |  | $ 79,571,000
Interest rate |  |  |  |  | 2.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt offering costs |  |  |  |  |  |  | 1,163,000 |  |  |  |  |  | $ 1,163,000 |  |  |  | 732,000 |  |  |  |  |  |  |  |  |  |
Percentage of minimum commitments utilization requirement |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of average daily unborrowed portion of financing commitments |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial principal amount |  |  |  |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 215,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 18, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  | 97,100,000 |  |  |  |  |  | $ 97,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and fees expense |  |  |  |  |  |  | 1,200,000 | $ 722,000 |  |  |  |  | 2,900,000 |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |
CLO par value |  |  |  |  |  |  | 97,100,000 |  |  |  |  |  | 97,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 95,908,000 |  |  |  |  |  | 95,908,000 |  |  |  | $ 79,839,000 |  |  |  |  |  |  |  |  |  |
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of borrowings |  |  |  |  |  |  | 95,900,000 |  |  |  |  |  | $ 95,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018-2 Secured Notes Class B-R Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,300,000 |
Stated Maturity |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 20, 2029 | [5] |  |  | Nov. 20, 2029 | [6] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 18,103,000 |  |  |  |  |  | $ 18,103,000 |  |  |  | $ 18,103,000 |  |  |  |  |  |  |  |  |  |
2018-2 Secured Notes Class A-1R-R Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Maturity |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 20, 2029 | [5] |  |  | Nov. 20, 2029 | [6] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 11,487,000 |  |  |  |  |  | $ 11,487,000 |  |  |  | $ 11,487,000 |  |  |  |  |  |  |  |  |  |
Debt instrument converted amount |  |  |  |  |  | 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument redemption, amount |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-R Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate amount of interest payable for first coverage test |  |  |  |  |  |  |  |  |  |  | 135.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 128.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-R Notes and B-R Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate amount of interest payable for first coverage test |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 118.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-1R-R and Class A-1T-R Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capitalization |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.875% Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, issuance date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.875% |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount |  | $ 2,430,000 |  |  |  |  | $ 1,819,000 |  |  |  |  |  | $ 1,819,000 |  |  |  | 2,157,000 |  |  |  |  |  |  |  |  |  |
Debt offering costs |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of outstanding debt |  |  |  |  |  |  | 105,300,000 |  |  |  |  |  | 105,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt offering costs |  |  |  |  |  |  | 880,000 |  |  |  |  |  | 880,000 |  |  |  | 951,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 105,301,000 |  |  |  |  |  | 105,301,000 |  |  |  | 104,892,000 |  |  |  |  |  |  |  |  |  |
4.875% Notes Due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 108,000,000 |  |  |  | $ 108,000,000 |  | $ 108,000,000 |  |  |  | 108,000,000 |  |  |  | 108,000,000 |  |  |  |  |  |
Interest rate |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Maturity |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  | semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, date of first required payment |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 16, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.875% Notes Due 2026 | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.875% Notes Due 2026 | Private Placement | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 28,000,000 |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.875% |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from offering of notes |  | $ 27,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from offering of notes |  |  |  | $ 77,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
6.125% Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.125% |  |  | 6.125% |  |  |  | 6.125% |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  | quarterly |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt offering costs |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument redemption, amount |  |  |  | $ 77,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption start date |  |  |  | Apr. 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption end date |  |  |  | May 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
6.125% Notes Due 2022 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 77,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,726,000 |  | $ 77,407,000
Interest rate |  |  |  |  |  |  |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from offering of notes |  |  |  |  |  |  |  |  |  | $ 74,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
HCAP Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 28,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Maturity |  |  | Sep. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument redemption, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,750,000 | $ 28,750,000 |  |  |
2018-2 Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 163,863,000 |  |  |  | $ 163,863,000 |  | $ 163,863,000 |  |  |  | 163,863,000 |  |  |  | $ 163,863,000 |  |  |  | $ 251,863,000 | 312,000,000.0 |
Debt discount |  |  |  |  |  |  | 1,270,000 |  |  |  |  |  | 1,270,000 |  |  |  | 1,403,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument redemption, amount |  |  |  |  |  |  |  |  | $ 88,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 162,593,000 |  |  |  |  |  | $ 162,593,000 |  |  |  | $ 162,460,000 |  |  |  |  |  |  |  |  |  |
Number of coverage tests | CoverageTest |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018-2 Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 108,000,000.0 |
[1] | As of June 30, 2022, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facilities of $93,071 and 2018-2 Secured Notes of $163,863.
[2] | Total amount of each class of senior securities outstanding at the end of the period presented.
[3] | As of March 31, 2022, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facilities of $80,571 and 2018-2 Secured Notes of $163,863.
[4] | Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[5] | The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.
[6] | The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.

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