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Marketable Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Available-for-sale securities:    
Due within one year $ 7,763 $ 9,156
Due after one year through three years 12,699 13,123
Total 20,462 22,279
Held-to-maturity securities    
Due within one year 16,727 0
Due after one year through three years 0 0
Total $ 16,727 $ 0