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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Cost | $ 1,147,209 | $ 1,153,584
Cost, Percentage | 100.00% | 100.00%
Fair Value | $ 1,091,531 | $ 1,094,386
Fair Value, Percentage | 100.00% | 100.00%
Green Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 142,302 | $ 142,931
Cost, Percentage | 12.30% | 12.30%
Fair Value | $ 151,712 | $ 152,117
Fair Value, Percentage | 14.00% | 14.00%
Finance and Insurance |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 124,793 | $ 113,645
Cost, Percentage | 10.90% | 9.90%
Fair Value | $ 124,984 | $ 114,131
Fair Value, Percentage | 11.50% | 10.40%
Food and Agriculture Technologies |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 100,012 | $ 101,279
Cost, Percentage | 8.70% | 8.80%
Fair Value | $ 99,610 | $ 101,947
Fair Value, Percentage | 9.10% | 9.30%
Real Estate Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 102,480 | $ 102,171
Cost, Percentage | 8.90% | 8.90%
Fair Value | $ 96,374 | $ 95,871
Fair Value, Percentage | 8.80% | 8.80%
Life Sciences |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 79,464 | $ 71,664
Cost, Percentage | 6.90% | 6.20%
Fair Value | $ 79,608 | $ 71,457
Fair Value, Percentage | 7.30% | 6.50%
Consumer Products & Services |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 72,387 | $ 71,811
Cost, Percentage | 6.30% | 6.20%
Fair Value | $ 72,034 | $ 70,129
Fair Value, Percentage | 6.60% | 6.40%
Space Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 70,644 | $ 71,476
Cost, Percentage | 6.20% | 6.20%
Fair Value | $ 70,853 | $ 71,607
Fair Value, Percentage | 6.50% | 6.50%
Healthcare |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 87,198 | $ 88,421
Cost, Percentage | 7.60% | 7.70%
Fair Value | $ 56,119 | $ 58,098
Fair Value, Percentage | 5.10% | 5.30%
Marketing, Media, and Entertainment |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 48,950 | $ 61,013
Cost, Percentage | 4.30% | 5.30%
Fair Value | $ 48,341 | $ 60,443
Fair Value, Percentage | 4.40% | 5.50%
Digital Assets Technology and Services |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 57,040 | $ 60,704
Cost, Percentage | 5.00% | 5.30%
Fair Value | $ 46,937 | $ 44,842
Fair Value, Percentage | 4.30% | 4.10%
Automation & Internet of Things |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 45,440 | $ 54,178
Cost, Percentage | 4.00% | 4.70%
Fair Value | $ 45,170 | $ 54,795
Fair Value, Percentage | 4.10% | 5.00%
Human Resource Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 40,830 | $ 40,678
Cost, Percentage | 3.60% | 3.50%
Fair Value | $ 41,704 | $ 41,226
Fair Value, Percentage | 3.80% | 3.80%
Connectivity |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 36,272 | $ 36,099
Cost, Percentage | 3.20% | 3.10%
Fair Value | $ 33,164 | $ 33,680
Fair Value, Percentage | 3.00% | 3.10%
Transportation Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 32,104 | $ 31,338
Cost, Percentage | 2.80% | 2.70%
Fair Value | $ 30,809 | $ 29,874
Fair Value, Percentage | 2.80% | 2.70%
SaaS |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 28,103 | $ 29,302
Cost, Percentage | 2.40% | 2.50%
Fair Value | $ 28,017 | $ 29,342
Fair Value, Percentage | 2.60% | 2.70%
Industrials |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 22,321 | $ 24,296
Cost, Percentage | 1.90% | 2.10%
Fair Value | $ 21,430 | $ 23,363
Fair Value, Percentage | 2.00% | 2.10%
Construction Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 22,341 | $ 23,731
Cost, Percentage | 1.90% | 2.10%
Fair Value | $ 17,647 | $ 19,609
Fair Value, Percentage | 1.60% | 1.80%
Education Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 18,959 | $ 18,962
Cost, Percentage | 1.70% | 1.60%
Fair Value | $ 14,358 | $ 14,334
Fair Value, Percentage | 1.30% | 1.30%
Supply Chain Technology |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 10,385 |
Cost, Percentage | 0.90% |
Fair Value | $ 7,476 | $ 7,521
Fair Value, Percentage | 0.70% | 0.70%
Multi-Sector Holdings |  |
Schedule Of Investments [Line Items] |  |
Cost | $ 5,184 |
Cost, Percentage | 0.50% |
Fair Value | $ 5,184 |
Fair Value, Percentage | 0.50% |

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