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Borrowings - Summary of 2018-2 Secured Notes (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | $ 317,806 |  | $ 373,308 |
2018-2 Secured Notes Class A-1R-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | 16,200 |  | 25,671 |
Outstanding Principal at Par |  | $ 16,332 |  | $ 25,880 |
Rating |  | AAA(sf) | [1] | AAA(sf) | [2]
Stated Maturity |  | Nov. 20, 2029 | [3] | Nov. 20, 2029 | [4]
2018-2 Secured Notes Class A-1T-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | $ 49,654 |  | $ 78,482 |
Outstanding Principal at Par |  | $ 49,811 |  | $ 78,933 |
Rating |  | AAA(sf) | [1] | AAA(sf) | [2]
Stated Maturity |  | Nov. 20, 2029 | [3] | Nov. 20, 2029 | [4]
2018-2 Secured Notes Class A-2-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | $ 54,681 |  | $ 54,681 |
Outstanding Principal at Par |  | $ 55,100 |  | $ 55,100 |
Rating |  | AA (sf) | [1] | AA (sf) | [2]
Stated Maturity |  | Nov. 20, 2029 | [3] | Nov. 20, 2029 | [4]
2018-2 Secured Notes Class B-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | $ 18,103 |  | $ 18,103 |
Outstanding Principal at Par |  | $ 18,250 |  | $ 18,250 |
Rating |  | A (sf) | [1] | A (sf) | [2]
Stated Maturity |  | Nov. 20, 2029 | [3] | Nov. 20, 2029 | [4]
2018-2 Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortized Carrying Value |  | $ 138,638 |  | $ 176,937 |
Outstanding Principal at Par |  | $ 139,493 |  | $ 178,163 |
LIBOR | 2018-2 Secured Notes Class A-1R-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread | [5] |  |  | 1.58% |
LIBOR | 2018-2 Secured Notes Class A-1T-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  | 1.58% |  | 1.58% |
LIBOR | 2018-2 Secured Notes Class A-2-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  |  |  | 2.45% |
LIBOR | 2018-2 Secured Notes Class B-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  |  |  | 3.17% |
SOFR | 2018-2 Secured Notes Class A-1R-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread | [6] | 1.58% |  |  |
SOFR | 2018-2 Secured Notes Class A-2-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  | 2.45% |  |  |
SOFR | 2018-2 Secured Notes Class B-R Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  | 3.17% |  |  |
SOFR | 2018-2 Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread |  | 0.26161% |  |  |
[1] | Represents ratings from each of S&P and DBRS for the Class A-1R-R Notes and the Class A-1T-R Notes and from S&P for the Class A-2-R Notes and Class B-R Notes as of the closing of the CLO on October 18, 2018.
[2] | Represents ratings from each of S&P and DBRS for the Class A-1R-R Notes and the Class A-1T-R Notes and from S&P for the Class A-2-R Notes and Class B-R Notes as of the closing of the CLO on October 18, 2018.
[3] | 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.
[4] | 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.
[5] | Interest may be indexed to either the CP Rate (as defined in the governing indenture) or three-month USD LIBOR.
[6] | Reference Rate is defined as the sum of the Term SOFR Rate plus 0.26161%.

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