Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.22.2.2
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Net Investment Income [Line Items]    
Marketable investments $ 89,873 $ 112,523
Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 50,015  
Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 39,858  
Corporate Bond Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 41,854 47,335
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 30,530  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 11,324  
US Treasury Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 19,485 24,153
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 19,485  
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 0  
Collateralized Mortgage-Backed Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 5,525 7,361
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 0  
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 5,525  
U S Agency And Government Sponsored Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 11,621 14,588
U S Agency And Government Sponsored Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 0  
U S Agency And Government Sponsored Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 11,621  
US Treasury Notes Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 10,830 11,682
US Treasury Notes Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 0  
US Treasury Notes Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments 10,830  
Asset-Backed Securities [Member]    
Net Investment Income [Line Items]    
Marketable investments 558 $ 6,406
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Net Investment Income [Line Items]    
Marketable investments 0  
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Net Investment Income [Line Items]    
Marketable investments $ 558