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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Tax Credit Carryforward [Line Items]      
Income taxes, including excise tax expense $ 611,000 $ 7,495 $ 70,000
Accumulated capital losses 582,153,000 304,240,000 $ 312,323,000
Cost of investments, income tax purposes 2,565,900,000 1,792,100,000  
Unrealized appreciation (depreciation) (105,800,000) 16,400,000  
Unrealized gross appreciation 112,400,000 45,600,000  
Unrealized gross depreciation 218,300,000 29,200,000  
Deferred tax assets, investments 9,500,000 8,600,000  
Deferred tax assets, valuation allowance 8,300,000 8,600,000  
Short-Term Capital Loss Carryforward      
Tax Credit Carryforward [Line Items]      
Accumulated capital losses 27,100,000 5,700,000  
Long-Term Capital Loss Carryforward      
Tax Credit Carryforward [Line Items]      
Accumulated capital losses $ 555,100,000 $ 298,500,000