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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 281,737	$ 373,271
Debt and equity securities, Amortized Cost	283,128	373,475
Debt and equity securities, Unrealized Gains	29	9
Debt and equity securities, Unrealized Losses	(1,420)	(213)
Debt and equity securities, Estimated Fair Value	281,737	373,271
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	23,324	140,287
Debt securities, Unrealized Gains	0	0
Debt securities, Unrealized Losses	(42)	(100)
Debt securities, Estimated Fair Value	23,282	140,187
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	47,327	49,512
Debt securities, Unrealized Gains	29	0
Debt securities, Unrealized Losses	(225)	(38)
Debt securities, Estimated Fair Value	47,131	49,474
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	22,196
Debt securities, Unrealized Gains	0
Debt securities, Unrealized Losses	(157)
Debt securities, Estimated Fair Value	22,039
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		26,006
Debt securities, Unrealized Gains		0
Debt securities, Unrealized Losses		(22)
Debt securities, Estimated Fair Value		25,984
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	190,281	157,670
Debt securities, Unrealized Gains	0	9
Debt securities, Unrealized Losses	(996)	(53)
Debt securities, Estimated Fair Value	$ 189,285	$ 157,626

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