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Investments - Summary of Company's Portfolio Investment by Industry at Cost and Fair Value and as Percentage of Total Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 1,419,998 | $ 1,319,316
Cost, Percentage |  | 100.00% | 100.00%
Fair Value |  | $ 1,363,862 | $ 1,275,180
Fair Value, Percentage |  | 100.00% | 100.00%
Finance and Insurance |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 190,781 | $ 139,399
Cost, Percentage |  | 13.30% | 10.60%
Fair Value |  | $ 189,158 | $ 133,344
Fair Value, Percentage |  | 13.90% | 10.50%
Green Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 149,648 | $ 138,510
Cost, Percentage |  | 10.50% | 10.50%
Fair Value |  | $ 154,883 | $ 143,279
Fair Value, Percentage |  | 11.40% | 11.20%
Space Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 124,130 | $ 185,384
Cost, Percentage |  | 8.70% | 14.10%
Fair Value |  | $ 124,504 | $ 186,335
Fair Value, Percentage |  | 9.10% | 14.60%
Consumer Products & Services |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 92,354 | $ 85,683
Cost, Percentage |  | 6.50% | 6.50%
Fair Value |  | $ 91,657 | $ 83,722
Fair Value, Percentage |  | 6.70% | 6.60%
Real Estate Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 93,027 | $ 94,878
Cost, Percentage |  | 6.60% | 7.20%
Fair Value |  | $ 89,264 | $ 91,344
Fair Value, Percentage |  | 6.50% | 7.20%
Healthcare Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 87,652 | $ 89,038
Cost, Percentage |  | 6.20% | 6.80%
Fair Value |  | $ 83,697 | $ 84,917
Fair Value, Percentage |  | 6.10% | 6.60%
Food and Agriculture Technologies |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 84,125 | $ 90,967
Cost, Percentage |  | 5.90% | 6.90%
Fair Value |  | $ 79,608 | $ 88,707
Fair Value, Percentage |  | 5.80% | 7.00%
Medical Devices |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 70,431 | $ 68,717
Cost, Percentage |  | 5.00% | 5.20%
Fair Value |  | $ 71,809 | $ 70,320
Fair Value, Percentage |  | 5.30% | 5.50%
Artificial Intelligence & Automation |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 64,679 | $ 34,732
Cost, Percentage |  | 4.60% | 2.60%
Fair Value |  | $ 63,905 | $ 34,435
Fair Value, Percentage |  | 4.70% | 2.70%
Biotechnology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 56,665 | $ 56,173
Cost, Percentage |  | 4.00% | 4.30%
Fair Value |  | $ 57,399 | $ 55,810
Fair Value, Percentage |  | 4.20% | 4.40%
SaaS |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 48,560 | $ 34,257
Cost, Percentage |  | 3.40% | 2.60%
Fair Value |  | $ 49,850 | $ 34,440
Fair Value, Percentage |  | 3.70% | 2.70%
Marketing, Media, and Entertainment |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 47,688 | $ 49,145
Cost, Percentage |  | 3.40% | 3.70%
Fair Value |  | $ 46,526 | $ 47,526
Fair Value, Percentage |  | 3.40% | 3.70%
Diagnostics & Tools |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 42,081 |
Cost, Percentage |  | 3.00% |
Fair Value |  | $ 42,081 |
Fair Value, Percentage |  | 3.10% |
Education Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 42,927 | $ 18,975
Cost, Percentage |  | 3.00% | 1.40%
Fair Value |  | $ 39,964 | $ 15,285
Fair Value, Percentage |  | 2.90% | 1.20%
Connectivity |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 36,161 | $ 36,191
Cost, Percentage |  | 2.50% | 2.70%
Fair Value |  | $ 34,794 | $ 34,219
Fair Value, Percentage |  | 2.60% | 2.70%
Human Resource Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 31,246 | $ 31,142
Cost, Percentage |  | 2.20% | 2.40%
Fair Value |  | $ 30,708 | $ 30,595
Fair Value, Percentage |  | 2.30% | 2.40%
Transportation Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 43,633 | $ 45,024
Cost, Percentage |  | 3.10% | 3.40%
Fair Value |  | $ 28,955 | $ 39,532
Fair Value, Percentage |  | 2.10% | 3.10%
Supply Chain Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 31,426 | $ 30,414
Cost, Percentage |  | 2.20% | 2.30%
Fair Value |  | $ 25,368 | $ 24,556
Fair Value, Percentage |  | 1.90% | 1.90%
Digital Assets Technology and Services |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 26,294 | $ 33,545
Cost, Percentage |  | 1.90% | 2.50%
Fair Value |  | $ 20,950 | $ 35,553
Fair Value, Percentage |  | 1.50% | 2.80%
Industrials |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 18,102 | $ 21,995
Cost, Percentage |  | 1.30% | 1.70%
Fair Value |  | $ 19,181 | $ 23,113
Fair Value, Percentage |  | 1.40% | 1.80%
Multi-Sector Holdings |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost | [1] | $ 13,420 | $ 11,006
Cost, Percentage | [1] | 0.90% | 0.80%
Fair Value | [1] | $ 14,003 | $ 11,335
Fair Value, Percentage | [1] | 1.00% | 0.90%
Construction Technology |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost |  | $ 24,968 | $ 24,141
Cost, Percentage |  | 1.80% | 1.80%
Fair Value |  | $ 5,598 | $ 6,813
Fair Value, Percentage |  | 0.40% | 0.50%
[1] | Multi-Sector Holdings consists of the Company's investment in Senior Credit Corp 2022 LLC, a joint venture between the Company and the JV Partner. This entity invests in secured loans and equipment financings to growth-stage companies that have been originated by the Company. The portfolio companies held by the JV represent a diverse set of industry classifications, which are similar to those in which the Company invests directly. See “Note 1 – Organization and Basis of Presentation” for further discussion.

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