Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Schedule of Quantitative Information of Fair Value Measurements (Details)

v3.22.2.2
Fair Value of Financial Instruments - Schedule of Quantitative Information of Fair Value Measurements (Details) - Level 3 significant unobservable inputs
$ in Thousands
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 2,661,399 $ 2,209,599
Equity and Warrant Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 86,279 118,884
Debt Maturing Within One Year | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 93,172 131,584
Debt Investments - Imminent Payoff | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments [1] 77,801  
Valuation Cost Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 130,945 441,524
Valuation Market Approach | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 29,721 26,587
Valuation Market Approach | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 10,968 $ 14,517
Valuation Market Approach | Minimum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [2] 0.0000  
Valuation Market Approach | Maximum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [2] 0.327  
Market Comparable Companies | Minimum | EBITDA Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3] 20.6 [4]
Market Comparable Companies | Minimum | EBITDA Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3],[5] 20.6 [4]
Market Comparable Companies | Minimum | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.6 [3] 1.0 [4]
Market Comparable Companies | Minimum | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.6 [3] 0.6 [4]
Market Comparable Companies | Minimum | Tangible Book Value Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 1.7 [3] 2.5 [4]
Market Comparable Companies | Minimum | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6] 0.0719 0.1881
Market Comparable Companies | Minimum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6]   0.1881
Market Comparable Companies | Maximum | EBITDA Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3] 20.6 [4]
Market Comparable Companies | Maximum | EBITDA Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3],[5] 26.0 [4]
Market Comparable Companies | Maximum | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 15.4 [3] 18.4 [4]
Market Comparable Companies | Maximum | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 9.3 [3] 9.5 [4]
Market Comparable Companies | Maximum | Tangible Book Value Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 1.7 [3] 2.5 [4]
Market Comparable Companies | Maximum | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6] 0.3268 0.3469
Market Comparable Companies | Maximum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6]   0.3735
Market Comparable Companies | Weighted Average | EBITDA Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3],[7] 20.6 [4],[8]
Market Comparable Companies | Weighted Average | EBITDA Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 11.5 [3],[5],[7] 20.7 [4],[8]
Market Comparable Companies | Weighted Average | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 6.6 [3],[7] 11.8 [4],[8]
Market Comparable Companies | Weighted Average | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 3.6 [3],[7] 4.5 [4],[8]
Market Comparable Companies | Weighted Average | Tangible Book Value Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 1.7 [3],[7] 2.5 [4],[8]
Market Comparable Companies | Weighted Average | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.2053 [2],[7] 0.2553 [6],[8]
Market Comparable Companies | Weighted Average | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.2135 [2],[7] 0.2693 [6],[8]
Liquidation | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 0 $ 0
Liquidation | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 0  
Liquidation | Minimum | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 2.1 [3] 2.1 [4]
Liquidation | Minimum | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [3] 7.1  
Liquidation | Minimum | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6] 0.8400 0.8400
Liquidation | Minimum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6] 0.9000  
Liquidation | Maximum | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 2.1 [3] 2.1 [4]
Liquidation | Maximum | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [3] 7.1  
Liquidation | Maximum | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [6] 0.8400 0.8400
Liquidation | Maximum | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [2] 0.9000  
Liquidation | Weighted Average | Revenue Multiple | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 2.1 [3],[7] 2.1 [4],[8]
Liquidation | Weighted Average | Discount for Lack of Marketability | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.8400 [2],[7] 0.8400 [6],[8]
Liquidation | Weighted Average | Discount for Lack of Marketability | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [2],[7] 0.9000  
Market Adjusted OPM Backsolve | Minimum | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [9]   (0.8867)
Market Adjusted OPM Backsolve | Maximum | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [9]   0.4722
Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [8],[9]   0.0081
Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [8],[9]   (0.0776)
Market Adjusted OPM Backsolve | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 13,397 $ 24,910
Market Adjusted OPM Backsolve | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 6,671 $ 11,914
Market Adjusted OPM Backsolve | Minimum | Market Equity Adjustment | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [9] (0.9729) (0.8867)
Market Adjusted OPM Backsolve | Minimum | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [10] (0.9729)  
Market Adjusted OPM Backsolve | Maximum | Market Equity Adjustment | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [9] 0.0780 0.4722
Market Adjusted OPM Backsolve | Maximum | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [10] 0.1057  
Market Adjusted OPM Backsolve | Weighted Average | Revenue Multiple | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [3],[7] 7.1  
Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [7],[9] (0.1668)  
Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [7],[9] (0.1868)  
Discounted Cash Flow | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 21,945 $ 11,990
Discounted Cash Flow | Minimum | Measurement Input, Discount Rate | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1708 [11] 0.1593 [12]
Discounted Cash Flow | Maximum | Measurement Input, Discount Rate | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.2880 [11] 0.2530 [12]
Discounted Cash Flow | Weighted Average | Measurement Input, Discount Rate | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.2332 [7],[11] 0.2046 [8],[12]
Other | Equity Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 3,577 [5] $ 27,920 [13]
Other | Warrant    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 0 [5] 1,046 [13]
Pharmaceuticals | Valuation Cost Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 37,851 $ 206,461
Pharmaceuticals | Valuation Cost Approach | Minimum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0928 0.1123
Pharmaceuticals | Valuation Cost Approach | Maximum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1026 0.1284
Pharmaceuticals | Valuation Cost Approach | Weighted Average | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1016 [14] 0.1140 [15]
Pharmaceuticals | Valuation Market Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 982,922  
Pharmaceuticals | Market Comparable Companies | Minimum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1048 0.0969
Pharmaceuticals | Market Comparable Companies | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   (0.0050)
Pharmaceuticals | Market Comparable Companies | Maximum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1810 0.1389
Pharmaceuticals | Market Comparable Companies | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0150 0.0075
Pharmaceuticals | Market Comparable Companies | Weighted Average | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15] 0.1317 0.1134
Pharmaceuticals | Market Comparable Companies | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0002 [14] 0.0006 [15]
Pharmaceuticals | Market Yield Analysis | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 451,587
Technology | Valuation Cost Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 109,904
Technology | Valuation Cost Approach | Origination Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 43,732  
Technology | Valuation Cost Approach | Minimum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0990 0.1112
Technology | Valuation Cost Approach | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.0100
Technology | Valuation Cost Approach | Maximum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1253 0.1168
Technology | Valuation Cost Approach | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.3500
Technology | Valuation Cost Approach | Weighted Average | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1041 [14] 0.1139 [15]
Technology | Valuation Cost Approach | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15]   0.3295
Technology | Valuation Market Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 910,488  
Technology | Market Comparable Companies | Minimum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1172 0.0898
Technology | Market Comparable Companies | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input (0.0075) (0.0050)
Technology | Market Comparable Companies | Maximum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1752 0.1454
Technology | Market Comparable Companies | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0150 0.0075
Technology | Market Comparable Companies | Weighted Average | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1422 [14] 0.1164 [15]
Technology | Market Comparable Companies | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0016 [14] 0.0012 [15]
Technology | Market Yield Analysis | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 654,320
Technology | Liquidation | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 4,270 $ 2,608 [16]
Technology | Liquidation | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1500 0.2000 [16]
Technology | Liquidation | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.5500 0.5000 [16]
Technology | Liquidation | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [16] 0.4657 [14] 0.4048 [15]
Technology | Valuation Income Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 20,354 $ 20,425
Technology | Valuation Income Approach | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0100  
Technology | Valuation Income Approach | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.5000  
Technology | Valuation Income Approach | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [14] 0.3583  
Medical Devices | Valuation Cost Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 14,835  
Medical Devices | Valuation Cost Approach | Minimum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1484  
Medical Devices | Valuation Cost Approach | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0050  
Medical Devices | Valuation Cost Approach | Maximum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1484  
Medical Devices | Valuation Cost Approach | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 50  
Medical Devices | Valuation Cost Approach | Weighted Average | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [14] 0.1484  
Medical Devices | Valuation Cost Approach | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15] 0.0050  
Lower Middle Market | Valuation Cost Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 25,595 $ 3,100
Lower Middle Market | Valuation Cost Approach | Minimum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0967 0.0517
Lower Middle Market | Valuation Cost Approach | Maximum | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0967 0.0517
Lower Middle Market | Valuation Cost Approach | Weighted Average | Measurement Input, Discount Rate | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0967 [14] 0.0517 [15]
Lower Middle Market | Valuation Market Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 308,155  
Lower Middle Market | Market Comparable Companies | Minimum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1271 0.1223
Lower Middle Market | Market Comparable Companies | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input (0.0200) 0.0000
Lower Middle Market | Market Comparable Companies | Maximum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1782 0.1601
Lower Middle Market | Market Comparable Companies | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0150 0.0150
Lower Middle Market | Market Comparable Companies | Weighted Average | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1394 [14] 0.1322 [15]
Lower Middle Market | Market Comparable Companies | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input (0.0038) [14] 0.0043 [15]
Lower Middle Market | Market Yield Analysis | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 81,566
Lower Middle Market | Liquidation | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 8,318 $ 8,269 [16]
Lower Middle Market | Liquidation | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.2000 0.2000 [16],[17]
Lower Middle Market | Liquidation | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.8000 0.8000 [1]
Lower Middle Market | Liquidation | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.8000 [14],[18] 0.8000 [15],[16]
Lower Middle Market | Expected Realizable Value | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments [1]   $ 90,504
Lower Middle Market | Expected Realizable Value | Minimum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.1064
Lower Middle Market | Expected Realizable Value | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   (0.0100)
Lower Middle Market | Expected Realizable Value | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [1]   0.3000
Lower Middle Market | Expected Realizable Value | Maximum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.1064
Lower Middle Market | Expected Realizable Value | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   (0.0100)
Lower Middle Market | Expected Realizable Value | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [1]   0.7000
Lower Middle Market | Expected Realizable Value | Weighted Average | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15]   0.1064
Lower Middle Market | Expected Realizable Value | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15]   (0.0100)
Lower Middle Market | Expected Realizable Value | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [1],[15]   0.5774
Sustainable And Renewable Technology | Valuation Cost Approach | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.4000
Sustainable And Renewable Technology | Valuation Cost Approach | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input   0.6000
Sustainable And Renewable Technology | Valuation Cost Approach | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15]   0.5184
Sustainable And Renewable Technology | Valuation Market Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 2,961  
Sustainable And Renewable Technology | Market Comparable Companies | Minimum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1367  
Sustainable And Renewable Technology | Market Comparable Companies | Minimum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0075  
Sustainable And Renewable Technology | Market Comparable Companies | Maximum | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.1367  
Sustainable And Renewable Technology | Market Comparable Companies | Maximum | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input 0.0075  
Sustainable And Renewable Technology | Market Comparable Companies | Weighted Average | Hypothetical Market Yield | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [14] 0.1367  
Sustainable And Renewable Technology | Market Comparable Companies | Weighted Average | Premium/(Discount) | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [14] 0.0075  
Sustainable And Renewable Technology | Valuation Income Approach | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 247
Sustainable And Renewable Technology | Expected Realizable Value | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments [17]   $ 7,500
Sustainable And Renewable Technology | Expected Realizable Value | Minimum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [17]   1
Sustainable And Renewable Technology | Expected Realizable Value | Maximum | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [17]   1
Sustainable And Renewable Technology | Expected Realizable Value | Weighted Average | Probability weighting of alternative outcomes | Debt Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Measurement Input [15],[17]   1.0000
[1] Expected realizable value represent debt investments that the Company expects to be fully repaid within the next three months, prior to their scheduled maturity date.
[2] Represents amounts used when the Company has determined market participants would take into account these discounts when pricing the investments.
[3] Represents amounts used when the Company has determined that market participants would use such multiples when pricing the investments.
[4] Represents amounts used when the Company has determined that market participants would use such multiples when pricing the investments.
[5] The fair market value of these investments is derived based on recent private market and merger and acquisition transaction prices.
[6] Represents amounts used when the Company has determined market participants would take into account these discounts when pricing the investments.
[7] Weighted averages are calculated based on the fair market value of each investment.
[8] Weighted averages are calculated based on the fair market value of each investment.
[9] Represents the range of changes in industry valuations since the portfolio company's last external valuation event.
[10] Represents the range of changes in industry valuations since the portfolio company's last external valuation event.
[11] The discount rate used is based on current portfolio yield adjusted for uncertainty of actual performance and timing in capital deployments.
[12] The discount rate used is based on current portfolio yield adjusted for uncertainty of actual performance and timing in capital deployments.
[13] The fair market value of these investments is derived based on recent market transactions.
[14] The weighted averages are calculated based on the fair market value of each investment.
[15] The weighted averages are calculated based on the fair market value of each investment.
[16] The significant unobservable input used in the fair value measurement of impaired debt securities is the probability weighting of alternative outcomes.
[17] Expected realizable value represent debt investments that the Company expects to be fully repaid within the next three months, prior to their scheduled maturity date.
[18] The significant unobservable input used in the fair value measurement of impaired debt securities is the probability weighting of alternative outcomes.