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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Commitments And Contingencies [Line Items]      
Outstanding refunded commitments $ 16.2   $ 21.4
Total lease expense 0.1 $ 0.1  
Right of use asset $ 2.5   $ 2.1
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets   Other Assets
Lease liability $ 2.7   $ 2.3
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable And Other Accrued Liabilities   Accounts Payable And Other Accrued Liabilities
I Fourty LLC [Member]      
Commitments And Contingencies [Line Items]      
Unfunded capital commitment $ 16.2    
Phoenix Office      
Commitments And Contingencies [Line Items]      
Lease commencement period Jul. 10, 2021    
Lease expiration period Dec. 31, 2028    
Lease extension period 5 years    
Final expiration date Dec. 31, 2038    
Remaining lease term 5 years 9 months 18 days    
Discount rates 3.75%    
San Diego Office      
Commitments And Contingencies [Line Items]      
Lease commencement period Mar. 10, 2023    
Lease expiration period Jan. 01, 2026    
Remaining lease term 2 years 9 months 18 days    
Discount rates 7.64%