Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Fair Value Portfolio By Industry Sector (Details)

v3.22.2.2
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%