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Investments - Schedule of Fair Value Portfolio By Industry Sector (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 2,825,738 | $ 2,434,522
Drug Discovery & Development |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,091,827 | 967,383
Software |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 680,216 | 585,622
Internet Consumer And Business Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 489,968 | 395,506
Healthcare Services Other |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 203,599 | 121,003
Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 101,094 | 105,490
Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 72,061 | 65,073
Information Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 59,735 | 74,417
Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 43,892 | 14,995
Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 25,497 | 28,099
Sustainable And Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 15,683 | 39,387
Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 20,621 | 22,498
Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 17,421 | 12,612
Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 2,498 | 1,040
Surgical Devices |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,536 | 1,029
Drug Delivery |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 90 | $ 368
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 | 38.60% | 39.70%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Software |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 24.10% | 24.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Internet Consumer And Business Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 17.30% | 16.30%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Healthcare Services Other |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 7.20% | 5.00%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 3.60% | 4.30%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 2.50% | 2.70%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Information Services |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 2.10% | 3.10%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.60% | 0.60%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.90% | 1.20%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Sustainable And Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.60% | 1.60%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.70% | 0.90%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.60% | 0.50%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.00%
Industry Sub Sector Concentration Risk [Member] | Revenue Benchmark | Surgical Devices |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.00%
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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