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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 373,271	$ 305,930
Equity securities, Amortized Cost	373,475
Equity securities, Unrealized Gains	9
Equity securities, Unrealized Losses	(213)
Equity securities, Estimated Fair Value	373,271
Debt and equity securities, Amortized Cost		305,899
Debt and equity securities, Unrealized Gains		74
Debt and equity securities, Unrealized Losses		(43)
Debt and equity securities, Estimated Fair Value		305,930
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	140,287	205,111
Debt securities, Unrealized Gains	0	6
Debt securities, Unrealized Losses	(100)	(27)
Debt securities, Estimated Fair Value	140,187	205,090
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	49,512	10,004
Debt securities, Unrealized Losses	(38)	(5)
Debt securities, Estimated Fair Value	49,474	9,999
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	26,006
Debt securities, Unrealized Losses	(22)
Debt securities, Estimated Fair Value	25,984
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		52,341
Debt securities, Unrealized Gains		47
Debt securities, Estimated Fair Value		52,388
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	157,670	38,443
Debt securities, Unrealized Gains	9	21
Debt securities, Unrealized Losses	(53)	(11)
Debt securities, Estimated Fair Value	$ 157,626	$ 38,453

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