Marketable Securities - Summary of Available -for-sale Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Amortized Cost	$ 902,536	$ 742,215
Gross Unrealized Gains	70	62
Gross Unrealized Losses	(2,325)	(3,823)
Estimated Fair Value	900,281	738,454
U.S. Treasury and Other Government Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	369,427	244,562
Gross Unrealized Gains	9	62
Gross Unrealized Losses	(1,134)	(1,938)
Estimated Fair Value	368,302	242,686
Financial Institution Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	417,802	380,891
Gross Unrealized Gains	59	0
Gross Unrealized Losses	(691)	(1,030)
Estimated Fair Value	417,170	379,861
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	79,251	102,059
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(311)	(509)
Estimated Fair Value	78,942	101,550
Other Asset Backed Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	36,056	14,703
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(189)	(346)
Estimated Fair Value	$ 35,867	$ 14,357