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Financial Highlights - Summary of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Feb. 24, 2025
Jan. 29, 2021
Per Share Data:              
Net asset value, beginning of period $ 13.19 $ 13.15 $ 16.4 $ 13.03 $ 14.97    
Net investment income 2.2 2.31 2.26 1.5 1.29    
Net realized and unrealized gains/(losses) on investments (0.01) (0.33) (3.22) 3.59 (0.81)    
Costs related to acquisition of Trinity Capital Holdings and Legacy Funds         (0.82)    
Net increase/(decrease) in net assets resulting from operations 2.19 1.98 (0.96) 5.09 (0.34)    
Offering costs (0.05) (0.09) (0.12) (0.29) (0.58)    
Effect of shares issued and repurchased 0.06 0.19 0.16 (0.15) (0.02)    
Equity component of convertible notes       (0.02) 0.03    
Distributions (2.04) (2.04) (2.33) (1.26) (1.03)    
Total increase/(decrease) in net assets 0.16 0.04 (3.25) 3.37 (1.94)    
Net asset value, end of period $ 13.35 $ 13.19 $ 13.15 $ 16.4 $ 13.03    
Shares outstanding, end of period 61,669,059 46,323,712 34,960,672 27,229,541 18,321,274    
Weighted average shares outstanding, basic 52,705,732 38,910,150 31,672,089 25,980,797 18,092,494    
Weighted average shares outstanding, diluted 56,728,848 42,705,875 35,189,709        
Total return based on net asset value 16.70% 15.80% (5.60%) 35.50% (6.10%)    
Total return based on market value 14.70% 55.80% (29.00%) 33.20%      
Ratio/Supplemental Data:              
Per share market value at end of period $ 14.47 $ 14.53 $ 10.93 $ 17.58   $ 15.93 $ 14
Net assets, end of period $ 822,982 $ 611,159 $ 459,649 $ 446,533 $ 238,748    
Ratio of total expenses to average net assets 17.50% 17.90% 16.30% 11.60% 14.30%    
Ratio of net investment income to average net assets 16.70% 17.50% 15.70% 10.50% 10.50%    
Ratio of interest and credit facility expenses to average net assets 8.90% 8.60% 7.50% 5.50% 7.60%    
Portfolio turnover rate 53.80% 41.70% 33.70% 47.90% 36.50%    
Asset coverage ratio 192.70% 194.70% 174.10% 195.80% 177.00%