Short-term Investments - Stated Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 137,506	$ 447,827
Due after one year through two years	213,380	0
Amortized Cost	350,886	447,827
Estimated Fair Value
Due within one year	137,389	440,858
Due after one year through two years	212,006	0
Total	$ 349,395	$ 440,858