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Marketable Securities - Stated Maturities of Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Due within one year $ 56,756 $ 149,791
Due after one year through two years 352,458 0
Amortized Cost 409,214 149,791
Estimated Fair Value    
Due within one year 56,756 149,903
Due after one year through two years 352,198 0
Total $ 408,954 $ 149,903