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Fair Value of Financial Instruments - Summary of Significant Unobservable Inputs Used to Measure The Fair Value Of The Level 3 Portfolio Investments (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	Mar. 31, 2023 USD ($) yr	Dec. 31, 2022 USD ($) yr
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 1,088,521	$ 1,093,063
Market Approach | Minimum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.4
Market Approach | Maximum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		3.2
Market Approach | Weighted Average | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		2.2
Debt investments | Discounted Cash Flows | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 929,280	$ 872,022
Debt investments | Discounted Cash Flows | Minimum | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.132	0.117
Debt investments | Discounted Cash Flows | Maximum | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.297	0.285
Debt investments | Discounted Cash Flows | Weighted Average | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.179	0.174
Debt investments | Originated Within the Past Three Months | Origination Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 93,891	$ 156,281
Debt investments | Originated Within the Past Three Months | Minimum | Origination Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.085	0.090
Debt investments | Originated Within the Past Three Months | Maximum | Origination Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.164	0.155
Debt investments | Originated Within the Past Three Months | Weighted Average | Origination Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.132	0.132
Debt investments | Scenario Analysis | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 23,927	$ 17,838
Debt investments | Scenario Analysis | Minimum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.050	0.050
Debt investments | Scenario Analysis | Maximum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1.000	0.800
Equity investments | Transactions Precedent | Transaction Price
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $		$ 2,688
Equity investments | Market Approach | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 15,454	$ 12,651
Equity investments | Market Approach | Minimum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.010	0.9
Equity investments | Market Approach | Minimum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.4	0.4
Equity investments | Market Approach | Minimum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.409	0.333
Equity investments | Market Approach | Minimum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.015	0.029
Equity investments | Market Approach | Minimum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.2
Equity investments | Market Approach | Maximum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.070	8.0
Equity investments | Market Approach | Maximum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	4.3	5.9
Equity investments | Market Approach | Maximum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.873	0.980
Equity investments | Market Approach | Maximum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.041	0.042
Equity investments | Market Approach | Maximum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	4.5
Equity investments | Market Approach | Weighted Average | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.019	2.0
Equity investments | Market Approach | Weighted Average | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.012	1.2
Equity investments | Market Approach | Weighted Average | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.654	0.518
Equity investments | Market Approach | Weighted Average | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.035	0.032
Equity investments | Market Approach | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	2.7
Equity investments | Black Scholes Option Pricing Model | Minimum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		1.9
Equity investments | Black Scholes Option Pricing Model | Maximum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		4.8
Equity investments | Black Scholes Option Pricing Model | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		3.0
Equity investments | Other | Minimum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.200
Equity investments | Other | Maximum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.800
Warrants | Market Approach | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 25,701	$ 30,442
Warrants | Market Approach | Minimum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.3
Warrants | Market Approach | Minimum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.3	0.2
Warrants | Market Approach | Minimum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.333	0.451
Warrants | Market Approach | Minimum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.005
Warrants | Market Approach | Minimum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.1	0.1
Warrants | Market Approach | Minimum | Company Specific Adjustment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.187
Warrants | Market Approach | Maximum | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	4.9
Warrants | Market Approach | Maximum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	8.0	8.5
Warrants | Market Approach | Maximum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1.052	1.022
Warrants | Market Approach | Maximum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.040
Warrants | Market Approach | Maximum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	5.0	5.0
Warrants | Market Approach | Maximum | Company Specific Adjustment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.300
Warrants | Market Approach | Weighted Average | Revenue Multiple Only
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.035
Warrants | Market Approach | Weighted Average | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.018	1.8
Warrants | Market Approach | Weighted Average | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.612	0.668
Warrants | Market Approach | Weighted Average | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.028	0.027
Warrants | Market Approach | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	2.3	2.3
Warrants | Market Approach | Weighted Average | Company Specific Adjustment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.287	0.283
Warrants | Black Scholes Option Pricing Model | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $	$ 268	$ 547
Warrants | Black Scholes Option Pricing Model | Minimum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.005
Warrants | Black Scholes Option Pricing Model | Maximum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.045
Warrants | Black Scholes Option Pricing Model | Weighted Average | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.654	0.654
Warrants | Black Scholes Option Pricing Model | Weighted Average | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.038	0.041
Warrants | Black Scholes Option Pricing Model | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1.5	3.7
Warrants | Black Scholes Option Pricing Model | Weighted Average | Discount for Lack of Marketability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		0.246
Warrants | Other | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments | $		$ 594

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- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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