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Fair Value Measurements - Summary of Carrying Value and Fair Value of Debt Obligations (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | $ 438,000 | $ 403,000
Debt obligations fair value | 405,036 | 368,817
SBA Debentures |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 188,000 | 153,000
Debt obligations fair value | 188,000 | 153,000
January 2026 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 125,000 | 125,000
Debt obligations fair value | 112,417 | 111,854
November 2026 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 125,000 | 125,000
Debt obligations fair value | 104,619 | 103,963
Credit Facility Borrowings |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 0 | 0
Debt obligations fair value | $ 0 | $ 0

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