Fair Value Measurement - Summary of Investment Assets Categorized within Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	$ 301,084	$ 412,144
Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	184,955	149,794
Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	40,002	62,355
Short Term Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	76,127	199,995
Level 1
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	84,085	212,159
Level 1 | Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	7,958	12,164
Level 1 | Short Term Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	76,127	199,995
Level 2
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	80,622	45,961
Level 2 | Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	80,622	44,858
Level 2 | Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets		1,103
Level 3
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	136,377	154,024
Level 3 | Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	104,333	104,936
Level 3 | Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Total investment assets	$ 32,044	$ 49,088