Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Summary of Financial Assets Measured at Fair Value on a Recurring Basis

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy:

	June 30, 2022
	Fair Value Hierarchy	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Market Value
	(In thousands)
Money market funds	Level 1	$	120,701	$	—	$	—		$	120,701
U.S. government treasury securities	Level 1		642,814		—		(6,224	)		636,590
Total cash equivalents and marketable    securities		$	763,515	$	—	$	(6,224	)	$	757,291
	December 31, 2021
	Fair Value Hierarchy	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Market Value
	(In thousands)
Money market funds	Level 1	$	218,451	$	—	$	—		$	218,451
U.S. government treasury securities	Level 1		407,041		8		(950	)		406,099
Total cash equivalents and marketable    securities		$	625,492	$	8	$	(950	)	$	624,550