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Investments - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt securities and restricted investments    
Fair Value $ 74,033 $ 88,956
U.S. Treasury Bills    
Debt securities and restricted investments    
Amortized Cost 74,731 88,966
Gross Unrealized Gains   1
Gross Unrealized (Losses) (698) (11)
Fair Value $ 74,033 $ 88,956