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Fair Value of Financial Instruments - Summary of Changes In Fair Value of Company's Level 3 Debt (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Non-cash conversion   $ (7,225,000)
Transfers into/(out of) of Level 3 $ 0  
Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 1,095,504,000 798,661,000
Purchases, net of deferred fees 68,510,000 626,211,000
Non-cash conversion (21,000) 6,688,000
Transfers into/(out of) of Level 3   (1,061,000)
Proceeds from sales and paydowns (82,795,000) (277,142,000)
Accretion of OID, EOT, and PIK payments 6,684,000 32,220,000
Net realized gain/(loss) $ (365,000) $ 19,368,000
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized Investment Gains Losses Realized Investment Gains Losses
Change in unrealized appreciation/(depreciation) $ (3,403,000) $ 57,329,000
Fair Value, Ending balance 1,090,962,000 1,095,504,000
Net change in unrealized appreciation/depreciation on Level 3 investments still held (3,086,000) 66,678,000
Debt | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 1,048,829,000 735,968,000
Purchases, net of deferred fees 66,854,000 612,294,000
Non-cash conversion (500,000)  
Proceeds from sales and paydowns (82,674,000) (273,787,000)
Accretion of OID, EOT, and PIK payments 6,684,000 32,220,000
Net realized gain/(loss) (296,000) 18,135,000
Change in unrealized appreciation/(depreciation) (8,201,000) (39,731,000)
Fair Value, Ending balance 1,047,098,000 1,048,829,000
Net change in unrealized appreciation/depreciation on Level 3 investments still held (7,954,000) (47,150,000)
Equity | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 13,245,000 21,788,000
Purchases, net of deferred fees 1,500,000 4,800,000
Non-cash conversion 521,000 537,000
Proceeds from sales and paydowns   (663,000)
Net realized gain/(loss)   676,000
Change in unrealized appreciation/(depreciation) (188,000) (12,541,000)
Fair Value, Ending balance 15,454,000 13,245,000
Net change in unrealized appreciation/depreciation on Level 3 investments still held (188,000) (13,879,000)
Warrants | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 30,989,000 36,753,000
Purchases, net of deferred fees 156,000 9,117,000
Transfers into/(out of) of Level 3   (1,061,000)
Proceeds from sales and paydowns (121,000) (981,000)
Net realized gain/(loss) (69,000) 557,000
Change in unrealized appreciation/(depreciation) (4,986,000) 5,057,000
Fair Value, Ending balance 25,969,000 30,989,000
Net change in unrealized appreciation/depreciation on Level 3 investments still held (5,056,000) 5,649,000
Escrow Receivable | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 2,441,000 4,152,000
Proceeds from sales and paydowns   (1,711,000)
Fair Value, Ending balance $ 2,441,000 $ 2,441,000