Marketable Securities - Schedule of Amortized Cost, Gross Unrealized Holding Losses and Fair Value of Available-for-Sale Debt Securities by Type of Security (Detail) - U.S. Government-Related Obligations [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available for sale securities:
Amortized Cost	$ 249,124	$ 60,357
Gross Unrealized Holding Gains		3
Gross Unrealized Holding Losses	(817)	(2)
Fair Value	$ 248,307	$ 60,358