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Fair Value of Financial Instruments - Summary of Company's Assets Measured at Fair Value by Investment Type on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | $ 1,088,521 | $ 1,093,063
Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 1,091,531 | 1,094,386
Escrow Receivable | 2,441 | 2,441
Cash and cash equivalents | 8,344 | 10,612
Total | 1,102,316 | 1,107,439
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 461 | 588
Cash and cash equivalents | 8,344 | 10,612
Total | 8,805 | 11,200
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 994 | 735
Total | 994 | 735
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 1,088,521 | 1,093,063
Escrow Receivable | 2,441 | 2,441
Total | 1,090,962 | 1,095,504
Fair Value, Recurring | Measured at Net Asset Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 1,555 |
Total | 1,555 |
Fair Value, Recurring | Secured Loans |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 808,002 | 802,851
Fair Value, Recurring | Secured Loans | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 808,002 | 802,851
Fair Value, Recurring | Equipment Financing |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 239,096 | 245,978
Fair Value, Recurring | Equipment Financing | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 239,096 | 245,978
Fair Value, Recurring | Warrants |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 26,963 | 31,724
Fair Value, Recurring | Warrants | Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 994 | 735
Fair Value, Recurring | Warrants | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 25,969 | 30,989
Fair Value, Recurring | Equity |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 17,470 | 13,833
Fair Value, Recurring | Equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 461 | 588
Fair Value, Recurring | Equity | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | 15,454 | $ 13,245
Fair Value, Recurring | Equity | Measured at Net Asset Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total Investments at fair value | $ 1,555 |

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