Fair Value Measurement - Summary of Investment Assets Categorized within Fair Value Hierarchy (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		$ 232,708	$ 301,084
Investments at Fair Value		236,410	301,084
Receivable
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Investments at Fair Value	[1]	3,702
Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		204,305	184,955
Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		27,368	40,002
Short Term Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		1,035	76,127
Level 1
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		8,285	84,085
Level 1 | Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		7,250	7,958
Level 1 | Short Term Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		1,035	76,127
Level 2
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		98,089	80,622
Level 2 | Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		98,089	80,622
Level 3
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		126,334	136,377
Level 3 | Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		106,216	104,333
Level 3 | Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		$ 20,118	$ 32,044

[1] Certain investments that are measured at fair value using net asset value (“NAV”) have not been categorized in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amount presented in the Consolidated Statements of Assets and Liabilities.