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Investments - Investments in a continual unrealized loss position (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]    
Continuous unrealized loss position, less than 12 months $ 29,701 $ 28,483
Continuous unrealized loss position, 12 months or longer 0 18,594
US Treasury Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Continuous unrealized loss position, less than 12 months 21,777 26,506
Continuous unrealized loss position, 12 months or longer   3,945
Corporate Bonds [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Continuous unrealized loss position, less than 12 months 0 1,977
Continuous unrealized loss position, 12 months or longer   14,649
US Government Debt Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Continuous unrealized loss position, less than 12 months $ 7,924 $ 0