Fair Value Measurements - Summarizes the Estimated Fair Value of Our Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Financial assets	$ 364,994
Corporate Securities
Financial assets:
Financial assets	80,389
Amortized Cost	80,506
Gross Unrealized Losses	(117)
Estimated Fair Value	80,389
Level 1
Financial assets:
Financial assets	284,605
Level 2
Financial assets:
Financial assets	80,389
Level 2 | Corporate Securities
Financial assets:
Financial assets	80,389
Money Market Funds
Financial assets:
Financial assets	262,679	$ 196,521
Amortized Cost	262,679	196,521
Estimated Fair Value	262,679	196,521
Money Market Funds | Level 1
Financial assets:
Financial assets	262,679	$ 196,521
U.S Treasury Securities
Financial assets:
Financial assets	21,926
Amortized Cost	21,999
Gross Unrealized Losses	(74)
Estimated Fair Value	21,925
U.S Treasury Securities | Level 1
Financial assets:
Financial assets	$ 21,926