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Fair Value Measurements - Summary of Carrying Value and Fair Value of Debt Obligations (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | $ 462,000 | $ 403,000
Debt obligations fair value | 425,996 | 368,817
SBA Debentures |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 182,000 | 153,000
Debt obligations fair value | 182,000 | 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 | 111,013 | 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 | 102,983 | 103,963
Credit Facility Borrowings |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt obligations carrying value | 30,000 | 0
Debt obligations fair value | $ 30,000 | $ 0

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