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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized appreciation (depreciation) on investments | $ 793 | $ (123)
Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 860,019 | 718,767
Net realized gains (losses) on investments | 58 | 6,868
Net change in unrealized appreciation (depreciation) on investments | (709) | 5,300
Purchase of investments | 51,521 | 114,428
Proceeds from sales and repayments of investments | (15,871) | (23,185)
Interest and dividend income paid-in-kind | 637 | 547
Proceeds from loan origination fees | (537) | (771)
Accretion of loan origination fees | 413 | 280
Accretion of original issue discount | 113 | 23
Ending Balance | 897,062 | 811,657
Subordinated Debt | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 101,456 | 36,064
Net change in unrealized appreciation (depreciation) on investments | 1,565 | (5)
Purchase of investments | 2,182 | 17,470
Interest and dividend income paid-in-kind | 314 | 41
Proceeds from loan origination fees | (25) | (165)
Accretion of loan origination fees | 22 | 8
Accretion of original issue discount | 2 |
Ending Balance | 102,386 | 53,413
First Lien Debt | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 456,105 | 354,922
Net change in unrealized appreciation (depreciation) on investments | (133) | (823)
Purchase of investments | 40,980 | 76,710
Proceeds from sales and repayments of investments | (15,699) | (4,027)
Interest and dividend income paid-in-kind | 127 | 252
Proceeds from loan origination fees | (481) | (602)
Accretion of loan origination fees | 366 | 238
Accretion of original issue discount | 16 | 1
Ending Balance | 481,547 | 428,317
Second Lien Debt | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 182,948 | 158,815
Net change in unrealized appreciation (depreciation) on investments | (698) | (1,277)
Purchase of investments | 5,000 | 15,795
Proceeds from sales and repayments of investments |  | (7,106)
Interest and dividend income paid-in-kind | 196 | 254
Proceeds from loan origination fees | (31) | (4)
Accretion of loan origination fees | 25 | 34
Accretion of original issue discount | 95 | 22
Ending Balance | 188,931 | 169,087
Equity | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 117,431 | 165,762
Net realized gains (losses) on investments | 58 | 6,868
Net change in unrealized appreciation (depreciation) on investments | (1,165) | 7,590
Purchase of investments | 3,359 | 4,453
Proceeds from sales and repayments of investments | (172) | (12,052)
Ending Balance | 121,841 | 157,441
Warrant | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 2,079 | 3,204
Net change in unrealized appreciation (depreciation) on investments | (278) | 195
Ending Balance | $ 2,357 | $ 3,399

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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