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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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