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Investments - Schedule of Fair Value Portfolio By Industry Sector (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,112,789 | $ 2,963,955
Drug Discovery & Development |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,137,725 | 1,150,707
Software |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 891,438 | 798,264
Consumer & Business Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 459,276 | 439,384
Healthcare Services Other |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 220,673 | 198,763
Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 105,343 | 101,833
Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 94,077 | 68,569
Information Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 73,306 | 60,759
Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 49,596 | 46,109
Biotechnology Tools |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 33,465 | 32,825
Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 20,727 | 21,517
Sustainable And Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 11,333 | 15,486
Media/Content/Info |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 11,542 | 35
Surgical Devices |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 731 | 3,038
Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,294 | 2,821
Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,052 | 1,834
Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,188 | 21,921
Drug Delivery |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 23 | $ 90
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Drug Discovery & Development |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 36.50% | 38.80%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Software |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 28.60% | 26.90%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Consumer & Business Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 14.80% | 14.80%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Healthcare Services Other |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 7.10% | 6.70%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 3.40% | 3.40%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 3.00% | 2.30%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Information Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 2.40% | 2.00%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.60% | 1.60%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Biotechnology Tools |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.10% | 1.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.70% | 0.70%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Sustainable And Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.40% | 0.50%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Media/Content/Info |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.40% | 0.00%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Surgical Devices |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.70%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Drug Delivery |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.00%

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