Marketable Securities - Summary of Fair Values and Unrealized Losses of Marketable Securities Held by the Company in an Unrealized Loss Position for Less Than 12 months and 12 Months or Greater (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 447,199	$ 55,507
Less than 12 Months, Unrealized Losses	(1,773)	(55)
Total, Fair Value	447,199	55,507
Total, Unrealized Losses	(1,773)	(55)
U.S. Government and Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	59,889
Less than 12 Months, Unrealized Losses	(229)
Total, Fair Value	59,889
Total, Unrealized Losses	(229)
Certificates of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	2,195
Less than 12 Months, Unrealized Losses	(11)
Total, Fair Value	2,195
Total, Unrealized Losses	(11)
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	385,115	55,507
Less than 12 Months, Unrealized Losses	(1,533)	(55)
Total, Fair Value	385,115	55,507
Total, Unrealized Losses	$ (1,533)	$ (55)