Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value of Financial Instruments
Money Market Funds	$ 34,710	$ 53,942
Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	498,089	571,482
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	21,422	40,967
Money Market Funds \| Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	21,422	40,967
Corporate Securities
Fair Value of Financial Instruments
Marketable securities	139,611	200,626
Corporate Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	139,611	200,626
Government Securities
Fair Value of Financial Instruments
Marketable securities	337,056	329,889
Government Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	337,056	329,889
Level 1 \| Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	21,422	40,967
Level 1 \| Money Market Funds \| Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	21,422	40,967
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	476,667	530,515
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	139,611	200,626
Level 2 \| Government Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	$ 337,056	$ 329,889

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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