Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Fair Value of Financial Instruments
Money Market Funds	$ 29,031	$ 53,790	$ 52,733
Marketable securities	725,317
Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	746,345	668,757
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	21,028	25,520
Money Market Funds | Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	21,028	25,520
Corporate Securities
Fair Value of Financial Instruments
Marketable securities	161,643	228,723
Corporate Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	161,643	228,723
Government Securities
Fair Value of Financial Instruments
Marketable securities	563,674	414,514
Government Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	563,674	414,514
Level 1 | Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	21,028	25,520
Level 1 | Money Market Funds | Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	21,028	25,520
Level 1 | Corporate Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	0	0
Level 1 | Government Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	0	0
Level 2 | Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	725,317	643,237
Level 2 | Money Market Funds | Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	0	0
Level 2 | Corporate Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	161,643	228,723
Level 2 | Government Securities | Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	$ 563,674	$ 414,514