Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details)

v3.23.3
Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Investments [Line Items]            
Investments, at fair value: $ 3,261,391   $ 3,261,391   $ 2,963,955  
Total fee income 6,405 $ 2,821 18,843 $ 9,110    
Total net change in unrealized appreciation (depreciation) (46,240) (2,089) (6,277) (87,147)    
Affiliate Investments            
Schedule Of Investments [Line Items]            
Investments, at fair value:   0   0    
Total interest and dividend income   81   1,204    
Total fee income   0   0    
Total net change in unrealized appreciation (depreciation)   4,631   4,089    
Total net realized gain (loss)   (2,014)   1,758    
Control investments            
Schedule Of Investments [Line Items]            
Investments, at fair value: 103,150 80,325 103,150 80,325 $ 76,458 $ 73,504
Total interest and dividend income 1,099 1,181 3,270 3,440    
Total fee income 22 18 60 51    
Total net change in unrealized appreciation (depreciation) (1,099) (2,571) 12,320 3,611    
Total net realized gain (loss) 0 0 0 0    
Control investments | Coronado Aesthetics, LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 247 400 247 400    
Total interest and dividend income 0 0 0 0    
Total fee income 0 0 0 0    
Total net change in unrealized appreciation (depreciation) (50) (22) (72) (165)    
Total net realized gain (loss) 0 0 0 0    
Control investments | Gibraltar Business Capital, LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 55,992 37,662 55,992 37,662    
Total interest and dividend income 772 853 2,299 2,531    
Total fee income 22 18 60 51    
Total net change in unrealized appreciation (depreciation) (1,726) (1,423) 4,676 (6,228)    
Total net realized gain (loss) 0 0 0 0    
Control investments | Hercules Adviser LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 40,668 33,945 40,668 33,945    
Total interest and dividend income 153 154 455 393    
Total fee income 0 0 0 0    
Total net change in unrealized appreciation (depreciation) 1,507 (1,236) 9,515 9,955    
Total net realized gain (loss) 0 0 0 0    
Control investments | Tectura Corporation            
Schedule Of Investments [Line Items]            
Investments, at fair value: 6,243 8,318 6,243 8,318    
Total interest and dividend income 174 174 516 516    
Total fee income 0 0 0 0    
Total net change in unrealized appreciation (depreciation) (830) 110 (1,799) 49    
Total net realized gain (loss) 0 0 0 0    
Affiliate investments            
Schedule Of Investments [Line Items]            
Total net change in unrealized appreciation (depreciation) 0 4,631 0 4,089    
Total net realized gain (loss) $ 0 (2,014) $ 0 1,758    
Affiliate investments | Black Crow AI, Inc. affiliates            
Schedule Of Investments [Line Items]            
Investments, at fair value:   0   0    
Total interest and dividend income   0   0    
Total fee income   0   0    
Total net change in unrealized appreciation (depreciation)   0   (120)    
Total net realized gain (loss)   0   3,772    
Affiliate investments | Pineapple Energy LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value:   0   0    
Total interest and dividend income   81   1,204    
Total fee income   0   0    
Total net change in unrealized appreciation (depreciation)   4,631   4,209    
Total net realized gain (loss)   (2,014)   (2,014)    
Control and Affiliate Issuer Investments            
Schedule Of Investments [Line Items]            
Investments, at fair value:   80,325   80,325    
Total interest and dividend income   1,262   4,644    
Total fee income   18   51    
Total net change in unrealized appreciation (depreciation)   2,060   7,700    
Total net realized gain (loss)   $ (2,014)   $ 1,758