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Investments - Scheduled Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Within one year $ 20,732 $ 58,733
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments 20,732 58,733
Fair Value    
Within one year 20,716 58,589
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments $ 20,716 $ 58,589