Investments - Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	$ 242,837	$ 230,174
Less Than 12 Months, Unrealized Losses	(557)	(1,037)
Total, Estimated Fair Value	242,837	230,174
Total, Unrealized Losses	(557)	(1,037)
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	28,776	15,945
Less Than 12 Months, Unrealized Losses	(82)	(11)
Total, Estimated Fair Value	28,776	15,945
Total, Unrealized Losses	(82)	(11)
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	211,563	58,254
Less Than 12 Months, Unrealized Losses	(473)	(291)
Total, Estimated Fair Value	211,563	58,254
Total, Unrealized Losses	(473)	(291)
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	2,498
Less Than 12 Months, Unrealized Losses	(2)
Total, Estimated Fair Value	2,498
Total, Unrealized Losses	$ (2)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		20,775
Less Than 12 Months, Unrealized Losses		(98)
Total, Estimated Fair Value		20,775
Total, Unrealized Losses		(98)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		135,200
Less Than 12 Months, Unrealized Losses		(637)
Total, Estimated Fair Value		135,200
Total, Unrealized Losses		$ (637)