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Fair Value of Financial Instruments - Summary of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - Level 3 significant unobservable inputs - USD ($) | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | $ 2,329,044,000 |  | $ 2,202,362,000 |
Net Realized Gains (Losses) | [1] | 7,402,000 |  | (61,480,000) |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (40,376,000) |  | 83,500,000 |
Purchases | [3] | 869,250,000 |  | 944,004,000 |
Sales |  | 88,282,000 |  | 6,498,000 |
Repayments | [4] | 314,417,000 |  | 754,373,000 |
Gross Transfers into Level 3 | [5] | 207,000 |  |  |
Gross Transfers out of Level 3 |  | 13,868,000 | [5] | 19,061,000 | [6]
Ending Balance |  | 2,748,960,000 |  | 2,388,454,000 |
Senior Secured |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 2,156,709,000 |  | 2,079,465,000 |
Net Realized Gains (Losses) | [1] | (1,883,000) |  | (3,744,000) |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (11,377,000) |  | 7,066,000 |
Purchases | [3] | 854,978,000 |  | 884,833,000 |
Sales |  | 73,500,000 |  |  |
Repayments | [4] | 314,417,000 |  | 754,373,000 |
Gross Transfers out of Level 3 | [5] | 3,504,000 |  |  |
Ending Balance |  | 2,607,006,000 |  | 2,213,247,000 |
Escrow Receivables |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 561,000 |  | 65,000 |
Net Realized Gains (Losses) | [1] | 401,000 |  | 584,000 |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (328) |  | (1,515,000) |
Purchases | [3] | 1,148,000 |  | 2,473,000 |
Sales |  | 500,000 |  | 1,036,000 |
Ending Balance |  | 1,282,000 |  | 571,000 |
Unsecured Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 52,890,000 |  | 14,970,000 |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (1,880,000) |  | (1,194,000) |
Purchases | [3] | 3,383,000 |  | 36,519,000 |
Ending Balance |  | 54,393,000 |  | 50,295,000 |
Preferred Note |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 69,439,000 |  | 58,981,000 |
Net Realized Gains (Losses) | [1] | 7,966,000 |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (22,458,000) |  | 54,508,000 |
Purchases | [3] | 3,614,000 |  | 13,954,000 |
Sales |  | 11,101,000 |  | 61,732,000 |
Gross Transfers out of Level 3 |  | 6,422,000 | [5] | 1,267,000 | [6]
Ending Balance |  | 41,038,000 |  | 64,444,000 |
Common Stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 21,968,000 |  | 27,398,000 |
Net Realized Gains (Losses) | [1] | (74,000) |  | (60,904,000) |
Net Change in Unrealized Appreciation (Depreciation) | [2] | 9,462,000 |  | 15,592,000 |
Purchases | [3] |  |  | 4,371,000 |
Sales |  | 19 |  | (60,900,000) |
Gross Transfers into Level 3 | [5] | 207,000 |  |  |
Gross Transfers out of Level 3 |  | 3,942,000 | [5] | 16,025,000 | [6]
Ending Balance |  | 27,602,000 |  | 31,332,000 |
Warrant |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Beginning Balance |  | 27,477,000 |  | 21,483,000 |
Net Realized Gains (Losses) | [1] | 992,000 |  | 2,584,000 |
Net Change in Unrealized Appreciation (Depreciation) | [2] | (13,795,000) |  | 9,043,000 |
Purchases | [3] | 6,127,000 |  | 1,854,000 |
Sales |  | 3,162,000 |  | 4,630,000 |
Gross Transfers out of Level 3 | [6] |  |  | 1,769,000 |
Ending Balance |  | $ 17,639,000 |  | $ 28,565,000 |
[1] | Included in net realized gains (losses) in the accompanying Consolidated Statements of Operations.
[2] | Included in net change in unrealized appreciation (depreciation) in the ac companying Consolidated Statements of Operations.
[3] | Amounts listed above are inclusive of loan origination fees received at the inception of the loan which are deferred and amortized into fee income as well as the accretion of existing loan discounts and fees during the period. Escrow receivable purchases may include additions due to proceeds held in escrow from the liquidation of level 3 investments. Amounts are net of purchases assigned to the Adviser Funds.
[4] | Amounts listed above include the acceleration and payment of loan discounts and loan fees due to early payoffs or restructures along with regularly scheduled amortization.
[5] | Transfers out of Level 3 during the nine months ended September 30, 2022 related to the initial public offerings of Gelesis, Inc., Pineapple Energy, LLC, and the conversion of Level 3 debt investments into common stock investments. Transfers into Level 3 during the nine months ended September 30, 2022 related to the decline of liquidity of Kaleido Biosciences, Inc. shares.
[6] | Transfers out of Level 3 during the nine months ended September 30, 2021, related to the initial public offerings of Proterra, Inc., 23andMe, Inc., Sprinklr, Inc., Century Therapeutics, Couchbase, Inc., and Xometry, Inc. There was no activity related to transfers into Level 3 during the nine months ended September 30, 2021.

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